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

Abstract

The invention relates to the technical field of optical display, in particular to an optical module comprising a lens, 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 from the first surface and is emitted from the second surface; the first surface is a plane, the second surface is a curved surface, and the curved surface enables light to present a convergence effect in the longitudinal direction of the second axis. According to the display lens optical module provided by the invention, the distribution of the light rays in the longitudinal direction can be adjusted, so that the light rays are deflected downwards to the visible area as much as possible, and the light emitting efficiency of the light rays is improved. When external interference light, such as sunlight, enters the lens, at least one part of the incident external light can be guided to the non-visual area through the light trap, so that the light interference is reduced, and the display contrast ratio is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of optical display technology, and in particular to an optical module comprising a lens, a display screen comprising the optical module, a display system, and a traffic information system. Background Art

[0002] LED display screens have the advantages of high brightness, splicing, convenience and flexibility, high efficiency and low consumption, which enable them to provide large-size displays and are widely used in outdoor scenes, especially in sports, advertising, finance, exhibitions, transportation and other fields.

[0003] Display information in outdoor scenes needs to be clear at a distance and readable under varying outdoor lighting conditions. Existing outdoor LED displays often fail to fully account for the specificities of outdoor scenes, such as the viewer's position and outdoor lighting conditions. This results in low light efficiency and poor contrast in strong outdoor light conditions. Summary of the Invention

[0004] The present invention proposes an optical module and a display screen, a display system and a traffic information system using the optical module, aiming to improve light output efficiency and enhance the contrast of outdoor displays.

[0005] To achieve the above-mentioned object, the present invention discloses an optical module in a first aspect, comprising a light source assembly, a first optical assembly and a second optical assembly, wherein:

[0006] A light source component, for emitting light;

[0007] The first optical assembly comprises a proximal end proximal to the light source assembly, a distal end distal to the light source assembly, and a midsection extending from the proximal end to the distal end along a first axis; the first optical assembly comprises a light guide portion, the light guide portion receiving light emitted from the light source assembly from the proximal end, the light entering the light guide portion being mixed in the light guide portion and then emitted;

[0008] The light guiding portion has a cross section in a transverse direction perpendicular to the first axis, and the edge profile of the cross section is polygonal; in a direction along the first axis toward the distal end, the light guiding portion has a same or larger cross section;

[0009] The second optical component includes a first surface proximal to the distal end of the first optical component and a second surface distal to 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, wherein the curved surface causes the light to exhibit a converging effect in a longitudinal direction along a second axis, wherein the second axis is perpendicular to the first surface and passes through a center point of the first surface.

[0010] As for the aforementioned optical module, the first axis is parallel to the second axis.

[0011] As for the aforementioned optical module, the first axis is located above the second axis.

[0012] As in the aforementioned optical module, the light-guiding portion of the first optical component is a solid structure formed of a light-guiding material with uniform density.

[0013] As described above, the optical module, the first optical component includes a tubular structure, which includes an outer wall and an inner wall surrounding the first axis; the light-guiding portion is a hollow channel formed by the inner wall; the inner wall has mirror properties, and the light entering the light-guiding portion is transmitted in the light-guiding portion and reflected on the inner wall.

[0014] As described above in the optical module, in the direction along the first axis toward the distal end, the light guiding portion includes a section with a gradually increasing cross-section.

[0015] As described above, in the optical module, in the direction along the first axis toward the distal end, the light guide portion has at least two segments connected to each other, and the at least two segments satisfy the following conditions:

[0016] Among the at least two sections, the cross section of the section closer to the proximal end increases faster.

[0017] As in the aforementioned optical module, the light guide portion has a longitudinal section along the longitudinal direction of the first axis; in the longitudinal section, the light guide portion includes a portion having an open profile that gradually increases along the first axis toward the distal end.

[0018] As described above, in the optical module, 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 meet the following two conditions:

[0019] A longitudinal cross-section of at least one of the at least two portions has a linearly or nonlinearly increasing open profile;

[0020] Among the at least two parts, the longitudinal section of the part closer to the proximal end has an open-shaped profile in which the opening increases faster.

[0021] As described above, the light-guiding 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 from entering the first optical component and is emitted again from the second optical component to the visible area; wherein, the first direction includes a direction from above the second axis and forming an acute angle with the second axis; the visible area includes an area outside the second surface of the second optical component and below the second axis.

[0022] As described above, the light-guiding portion is a solid structure formed of an isotropic light-guiding material with uniform density; the light trap includes a first reflective surface provided in the light-guiding portion near the distal end. When external light is incident on the second surface of the second optical component in a first direction and passes through the second optical component into the light-guiding portion, at least a portion of the light is reflected at the first reflective surface and then emitted from the light-guiding 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 then emitted directly from the light-guiding portion to the non-visible area.

[0023] As described above in the optical module, in the longitudinal direction along the first axis, the light guide portion has a longitudinal section; in the longitudinal section, the first reflective surface includes an open lower profile that increases linearly downward.

[0024] As described above, the first optical component includes a tubular structure, which includes an outer wall and an inner wall surrounding the first axis; the light-guiding portion is a hollow channel formed by the inner wall; the inner wall has mirror properties, and the light entering the light-guiding portion is transmitted in the light-guiding portion and reflected on the inner wall; the light trap includes a notch structure provided in the light-guiding portion near the distal end, and the notch structure includes a channel located below the first axis and penetrating downwardly 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 into the first optical component, at least a portion of the light is emitted from the channel of the notch structure to the non-visible area outside the optical module.

[0025] As in the aforementioned optical module, the projection of the focus or main focus corresponding to the convergence effect of the second optical component in the longitudinal direction on the first axis is located in the projection area of the channel of the notch structure on the first axis.

[0026] As described above, in the optical module, a portion of the surface of the channel of the notch structure constitutes a second reflective surface, and the second reflective surface is arranged 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 into 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.

[0027] As mentioned above in the optical module, the second optical component is a converging lens.

[0028] As the aforementioned optical module, the converging lens includes an upper lens and a lower lens respectively located above and below the second axis, wherein the focal length or main focal length of the upper lens is shorter than the focal length or main focal length of the lower lens.

[0029] A second aspect of the present invention provides a display screen, which includes the optical module provided by the first aspect of the present invention.

[0030] The third aspect of the present invention provides a display system, which includes a display screen and a screen control system, wherein the display screen includes the optical module provided in the first aspect of the present invention, and the screen control system is used to control the information display action of the display screen.

[0031] A fourth aspect of the present invention provides 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 provided in the first aspect of the present invention.

[0032] The technical solution provided by the present invention can have the following beneficial effects:

[0033] 1. In the display lens optical module provided by the present invention, the distribution of light in the longitudinal direction can be adjusted to deflect the light downward as much as possible into the visible area, thereby improving the light extraction efficiency.

[0034] 2. When external interfering light, such as sunlight, enters the lens, a light trap can be used to guide at least a portion of the incoming external light to the non-visible area, thereby reducing light interference and enhancing display contrast. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0036] Figure 1 This is a diagram of the optical module framework of the present invention; Figure 2A A side view of an optical module of a first optical component having a solid structure according to the present invention; Figure 2B A side view of an optical module of the present invention having a first optical component with a hollow channel; Figure 3 is a schematic diagram showing a change in the cross section of the light guide portion of the present invention along the first axis; Figure 4A is a schematic diagram showing that the cross-sectional profile of the second optical component in the horizontal direction of the present invention is a symmetrical convex surface; Figure 4B is a schematic diagram showing that the cross-sectional profile of the second optical component in the horizontal direction of the present invention is a symmetrical concave surface; Figure 4C is a schematic diagram showing that the cross-sectional profile of the second optical component in the horizontal direction of the present invention is an asymmetric convex surface; Figure 4D is a schematic diagram showing that the cross-sectional profile of the second optical component in the longitudinal direction of the present invention is a symmetrical convex surface; Figure 4E is a schematic diagram showing that the cross-sectional profile of the second optical component in the longitudinal direction of the present invention is an asymmetric convex surface; Figure 5A A schematic diagram showing a change in the cross section of the light guide portion of the present invention along the first axis; Figure 5B is another schematic diagram showing a change in the cross section of the light guide portion of the present invention along the first axis; Figure 5C is another schematic diagram showing a change in the cross section of the light guide portion of the present invention along the first axis; Figure 6A is a schematic diagram of a longitudinal cross-section of the light guide portion along the first axis of the present invention; Figure 6B is another schematic diagram of a longitudinal cross-section of the light guide portion along the first axis of the present invention; Figure 6C is another schematic diagram of a longitudinal cross-section of the light guide portion along the first axis of the present invention; Figure 7 A schematic diagram of the spatial position between the outdoor display screen of the present invention and the viewer; Figure 8A A schematic diagram of a light path along the first axis emitted by the light source assembly when the first axis of the light guide portion and the second axis of the lens are located in the same horizontal plane; Figure 8B A schematic diagram of a light path emitted along the first axis by the light source assembly 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; Figure 8C Schematic diagram of a light path passing through the focus F1 of the upper lens and the focus F2 of the lower lens when the first axis of the light guide portion and the second axis of the lens are located in the same horizontal plane and the upper lens has a smaller curvature or focal length than the lower lens; Figure 8D Schematic diagram of a light path passing through the focus F1 of the upper lens and the focus F2 of the lower lens 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 and the upper lens has a smaller curvature or focal length than the lower lens; Figure 9A This is a schematic structural diagram of a light-guiding portion of a solid structure provided with a first reflective surface according to the present invention; Figure 9B For external sunlight Figure 9A Light path diagram of an embodiment; Figure 10A This is a schematic diagram of an exemplary structure of a light guide portion of a solid structure provided with a light trap according to the present invention; Figure 10B Another exemplary structural diagram of a light guide portion of a solid structure provided with a light trap according to the present invention; Figure 10C Another exemplary structural diagram of a light guide portion of a solid structure provided with a light trap according to the present invention; Figure 10D Another exemplary structural diagram of a light guide portion of a solid structure provided with a light trap according to the present invention; Figure 10E This is another exemplary structural diagram of a light trap of an optical module having a light-guiding portion with a solid structure according to the present invention; Figure 11A This is a three-dimensional schematic diagram of the light guide portion of the present invention being a hollow channel and provided with a notch structure; Figure 11B For external sunlight Figure 11A A light path diagram of the embodiment of the upper lens entering the notch structure; Figure 11C For external sunlight Figure 11A A light path diagram of the embodiment of the embodiment after the lower lens enters the notch structure; Figure 12 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; Figure 13A A light path diagram of light emitted when the light guide portion is a hollow channel without a notch structure; Figure 13B A light path diagram of light emitted when the light guide portion is a hollow channel with a notch structure; Figure 14A This is a schematic structural diagram of the notch structure of the present invention having a second reflective surface; Figure 14BFor external sunlight Figure 14A A light path diagram of the embodiment after the second optical component enters the notch structure; Figure 14C for Figure 14A A schematic longitudinal cross-sectional view of an embodiment along a first axis; Figure 15A This is a simulation result diagram of the light emitted after sunlight enters the optical module in Test Example 1; Figure 15B This is a simulation result diagram of the light emitted by the light source assembly in Test Example 1 after passing through the first optical assembly and the second optical assembly; Figure 16A This is a simulation result diagram of the light emitted after sunlight enters the optical module in Test Example 2; Figure 16B This is a simulation result diagram of the light emitted by the light source assembly in Test Example 2 after passing through the first optical assembly and the second optical assembly; Figure 17A This is a simulation result diagram of the light emitted after sunlight enters the optical module in Test Example 3; Figure 17B This is a simulation result diagram of the light emitted by the light source assembly in Test Example 3 after passing through the first optical assembly and the second optical assembly; Figure 18A This is a simulation result diagram of the light emitted after sunlight enters the optical module in Test Example 4; Figure 18B This is a simulation result diagram of the light emitted by the light source assembly in Test Example 4 after passing through the first optical assembly and the second optical assembly.

[0037] In the accompanying drawings: light source assembly 1, first optical assembly 2, proximal end 21, middle section 22, distal end 23, first axis 24, light guide portion 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, and middle piece 4. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] It should be noted that in the present invention, if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "perpendicular", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms should be interpreted as the relative position relationship, movement status, etc. between the components in a certain specific posture (for example, 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 the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0040] In the present invention, when terms such as "connect" and "fix" appear, these terms should be understood broadly. For example, "fix" can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] In the present invention, if a first feature is described as being "above" or "below" a second feature, or similar descriptions appear, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, "above," "above," and "above" a first feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. "Below," "below," and "below" a first feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] In the present invention, the term "comprising" should be understood to mean that the latter is a subset of the former, without requiring the latter to be a true subset of the former. For example, "A includes B" should be understood to include both "A includes B and other components other than B" and "A only includes B."

[0043] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that meet both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] The present invention proposes an optical module, such as Figure 1 As shown, the optical system includes 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 is refracted and reflected. The light rays that have been reflected multiple times mix with each other and are emitted from the first optical assembly 2 into the second optical assembly 3. The second optical assembly has a converging effect in the longitudinal direction along its axis, thereby converging the light rays that have entered the second optical assembly 3 and then emitting them.

[0045] Light source assembly 1 is used to emit light. In an embodiment, light source assembly 1 may adopt 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). Light source assembly 1 may include, but is not limited to, a solid-state LED light source (such as an LED or a laser diode (or "diode laser")). Light source assembly 1 may involve a single light source or multiple light sources, and accordingly, the LED may also include a single or multiple LEDs.

[0046] The light source assembly 1 may include a monochromatic light source or a multicolor light source, for example, a blue light source, a green light source, or a red light source. When the light source assembly 1 is an LED, it may be a monochromatic LED or a full-color LED.

[0047] 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 chip in the form of a semiconductor chip that is neither packaged nor connected, but is directly mounted on a substrate such as a printed circuit board (PCB). Therefore, multiple semiconductor light sources can be configured on the same substrate. In an embodiment, the COB can be multiple LED chips configured together as a single lighting module.

[0048] In an embodiment, the light source assembly 1 may be a chip LED.

[0049] like Figure 2A and 2B As shown, the first optical component 2 has a proximal end 21 close to the light source component 1, a distal end 23 away from the light source component, and a middle section 22 extending from the proximal end to the distal end along the first axis 24; the first optical component 2 includes a light guiding portion 25, which receives light emitted from the light source component 1 from the proximal end 21, and the light entering the light guiding portion is mixed in the light guiding portion and then emitted.

[0050] exist Figure 2A In the embodiment shown, the first optical component 2 is a solid structure, and the light guide portion 25 is the solid structure of the first optical component 2, that is, the first optical component 2 itself constitutes the light guide portion 25, so the mark 25 is not shown in the figure; Figure 2B In the illustrated embodiment, the first optical component 2 is a tubular structure, and the light guide portion 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 dotted line is the light guide portion 25 .

[0051] The light-guiding portion 25 has a cross-section 251 in a direction perpendicular to the first axis 24, and the edge profile of the cross-section is a polygon, such as a triangle, a quadrilateral, a pentagon, etc. The cross-section 251 can be a symmetrical figure or an asymmetrical figure. In the direction along the first axis 24 toward the distal end 23, the light-guiding portion 25 has the same or a larger cross-section 251'. This means that the cross-section of the light-guiding portion 25 may remain unchanged, or the cross-section of the light-guiding portion closer to the distal end 23 may be larger than the cross-section closer to the proximal end 21 (e.g., Figure 3 As shown), the cross section may increase gradually or discontinuously.

[0052] like Figure 3 FIG. 4 shows possible changes in the cross section of the light guide portion 25 of the first optical component 2 along the first axis. Figure 3 As shown, the light guide portion 25 has a cross-section 251 perpendicular to the first axis 24, with the cross-section 251 having a polygonal outline. In a direction along the first axis 24 toward the distal end 23, the light guide portion has a larger cross-section 251'. This means that the cross-section of the light guide portion is largest at the distal end 23.

[0053] When the cross section of the light guide portion is a polygon, any side of the polygon either remains unchanged or becomes longer in the direction along the first axis 24 toward the distal end 23 , thereby ensuring that the light guide portion 25 has the same or larger cross section 251 .

[0054] Figure 3It is shown 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 portion 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. Figure 3 The outline of the light-guiding portion is shown by a dotted straight line, which shows the manner in which the cross-section changes continuously linearly. It should be understood that the design of the present invention also includes a manner in which the cross-section changes nonlinearly, for example, the upper and lower side lines of the longitudinal section of the light-guiding portion along the first axis in the axial direction satisfy a quadratic curve function, for example, the longitudinal section is shaped like a square horn opening.

[0055] like Figure 2A and 2B As shown, the second optical component 3 includes a first surface 31 proximal to the distal end 23 of the first optical component and a second surface 32 distal to the first optical component. The second optical component 3 has a second axis 33. Light emitted from the first optical component enters the second optical component 3 from the first surface 31 and exits from the second surface 32.

[0056] The first surface 31 is flat, while the second surface 32 is curved. This curve causes light to converge longitudinally along a second axis 33, which is perpendicular to the first surface 31 and passes through the center of the first surface 31. This convergence effect refers to the phenomenon in which light is deflected toward the principal optical axis when passing through an optical element (here, the second optical component). When the principal optical axis is the second axis, light emitted through the first optical component and then converged by the second optical component is deflected toward the second axis, thereby converging longitudinally along the second axis.

[0057] The second optical component 3 may be a converging lens.

[0058] The second optical component 3 may be a flat lens, the first surface 31 is a flat surface, and the second surface 32 is a curved surface.

[0059] The second surface 32 may be a spherical surface or an aspherical surface. Aspherical surfaces include, but are not limited to, quadratic surfaces and free-form surfaces. A quadratic surface can be understood as a surface formed by rotating a quadratic curve, such as a parabola, ellipse, or hyperbola, about an axis of symmetry. A free-form surface can be understood as a surface that does not have rotational or translational symmetry constraints.

[0060] The second surface 32 may be a symmetrical curved surface or an asymmetrical curved surface. In an embodiment, the second surface 32 may be symmetrical in the horizontal direction and asymmetrical in the longitudinal direction along the second axis 33 .

[0061] The second surface 32 may be a curved surface having a converging effect in the longitudinal direction along the second axis 33. In the horizontal direction, the second surface 32 may be designed according to actual needs, for example, having a converging effect, a diverging effect, or a combination of partially converging and partially diverging effects.

[0062] Figure 4A 、 4B 4C, 4D, and 4E respectively show the outlines of the second optical component in the horizontal and longitudinal directions.

[0063] Figure 4A 、 4B 4C and 4C respectively show that the cross-sectional profile of the second optical component in the horizontal direction is a symmetrical convex surface, a symmetrical concave surface, and an asymmetrical convex surface; Figure 4D and 4E The longitudinal cross-sectional profiles of the second optical component are shown as symmetrical convex and asymmetrical convex, respectively. It should be understood that these are merely exemplary cross-sectional profiles of the second optical component. According to the design principles of the present invention, the second optical component can have convex and / or concave portions in the horizontal direction to achieve converging and / or diverging effects, depending on actual needs. In the longitudinal direction, the second optical component can have a convex surface to achieve a converging effect.

[0064] The light source assembly 1 and the proximal end 21 of the first optical assembly 2 can be closely adjacent, for example, touching or close to each other, or can be spaced apart, for example, with a spacing or with other components or devices interposed therebetween. Regardless of the arrangement, at least a portion of the light emitted by the light source assembly 1 is ensured to be directly or indirectly emitted into the light-guiding portion of the first optical assembly 2.

[0065] The light source assembly 1 and the light guide portion 25 may be arranged facing each other or not facing each other.

[0066] The center of the light source assembly 1 may be located on the first axis 24 .

[0067] The projection of the light emitting surface of the light source assembly 1 on the plane where the cross section 251 of the light guide portion is located has an overlapping area with the cross section 251 , so that at least a portion of the light emitted by the light source assembly 1 enters the light guide portion 25 .

[0068] In the optical module of the present invention, at least one first optical component 2 is configured corresponding to each light source component 1 ; and at least one second optical component 3 is configured corresponding to each first optical component 2 .

[0069] In the embodiment, each light source assembly 1 is correspondingly configured with a first optical assembly 2 and a second optical assembly 3. The center of the light source assembly 1 is located on the first axis 24 of the first optical assembly 2, and the light-emitting surface of the light source assembly 1 is located within the projection area of the light guide portion 25 along the axis, so that the first optical assembly 2 can receive the light emitted by the light source assembly 1 as much as possible.

[0070] In the embodiment, the light source assembly 1 is sufficiently close to the first optical assembly 2 so that the first optical assembly can receive the light emitted by the light source assembly 1 to a maximum extent.

[0071] The distal end 23 of the first optical component 2 and the second optical component 3 are positioned such that light emitted from the light guide 25 enters 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.

[0072] The distal end 23 of the first optical component 2 can be tightly fitted with the second optical component 3, and the distal end 23 of the first optical component 2 can also be connected to the second optical component 3 through an intermediate piece, so that the light emitted by the light guide 25 is emitted into the second optical component 3 as much as possible. Figure 9A and 9B shown.

[0073] In some embodiments, along the first axis 24 , the cross-sections of the first optical component 2 and the second optical component 3 at the point where they are closely attached are coplanar.

[0074] The light guide 25 can be a solid structure, for example, formed of a certain material. The light guide rod 25 can be made of an isotropic material with uniform density. In an embodiment, the material of the light guide 25 can be plastic, such as polycarbonate or polymethyl methacrylate, or can be glass or silicone.

[0075] When the light guide portion 25 is a solid structure, the light guide portion 25 has an interface that constitutes 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 a plane. The light emitted by 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 be transmitted within the light guide portion 25, and the refracted light will leave the interface of the light guide portion 25 and be transmitted outside the light guide portion 25. Therefore, the transmission of light within the light guide portion 25 will generate loss at the interface, and the original transmission direction will be changed due to the reflection at the interface, causing light mixing within the light guide portion 25.

[0076] The light guide 25 can also be a hollow channel, for example, formed by a tubular structure comprising an outer wall and an inner wall surrounding the first axis 24. The inner wall has a mirror-like surface. The hollow channel is filled with a medium, such as air. The mirror-like surface means that when light reaches the wall, most of the light is reflected there, resulting in minimal loss. An inner wall with a mirror-like surface often has a highly smooth surface, i.e., a high-gloss polished surface, resulting in high reflectivity.

[0077] When light guide 25 is a hollow channel, it is enclosed by the inner wall of the tubular structure. Light emitted by light source assembly 1 enters light guide 25, where at least a portion of the light is reflected by the inner wall. The reflected light continues to propagate within light guide 25. Reflection on the inner wall changes the propagation direction of some of the light, causing it to mix within light guide 25. To reduce light loss at the inner wall, the inner wall should have a high-reflectivity, mirror-like surface to enhance light reflection.

[0078] In order to better guide the transmission of light in the light-guiding portion 25, for example, to obtain a desired mixing effect, or to obtain a desired emission angle effect, so that when the light leaves the first optical component 2 and enters the second optical component 3, the optical properties of the second optical component 3 can be effectively utilized to achieve a long-distance visual effect, the light-guiding portion 25 of the present invention has the following characteristics.

[0079] The light guide portion 25 has a cross section 251 in a direction perpendicular to the first axis 24. The edge profile of the cross section is a polygon, such as a triangle, a quadrilateral, a pentagon, etc. The cross section 251 can be a symmetrical figure or an asymmetrical figure. 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 2 ). This means that the cross section of the light guide 25 may remain constant; or the cross section of the light guide 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.

[0080] The light guide may be symmetrical or asymmetrical about the first axis.

[0081] The light guide can be either a solid structure or a hollow channel. The key point is that the light entering the light guide from the light source assembly 1 is mainly reflected at the interface or inner wall, so that the light is mixed after multiple reflections. The mixed light is then emitted from the light guide into the second optical assembly. Therefore, whether it is a solid structure or a hollow channel, the light guide has a cross section, such as Figure 5A 、 5B, 5C, 6A, 6B and 6C exemplarily show the ways in which the cross-section of the light guide portion may be varied, and these examples of variations are applicable to light guide portions of solid structures and air channels.

[0082] like Figure 5A 、 5B As shown in Figures 5C and 5C , light-guiding portion 25 includes a section 252 having a gradually increasing cross-section 251 along first axis 24 toward distal end 23. The manner in which the cross-section 251 of light-guiding portion 25 gradually increases can be linear or nonlinear, and is therefore represented by dashed lines. In other words, the dashed lines do not limit the lines connecting vertices (e.g., edges) of different cross-sections to straight lines.

[0083] The segment 252 may be a portion of the light guide 25 .

[0084] For example, Figure 5A As shown, one end of the 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 .

[0085] In an embodiment, the cross section of another portion of the light guide portion 25 relative to the section 252 may remain unchanged or increase.

[0086] The segment 252 may also be the entire light guide portion 25 .

[0087] like Figure 5B As shown, the cross section 251 of the light guiding portion 25 gradually increases from the proximal end 21 to the distal end 23 along the first axis 24 .

[0088] In a direction approaching the distal end 23 along the first axis 24, the light guide 25 may include at least two segments connected to each other. In the at least two segments, the speed at which the cross section 251 of each segment increases may be partially the same or different. In some embodiments, the cross section 251 of the segment closer to the proximal end 21 increases faster.

[0089] For example, the light guide portion 25 includes two sections. Figure 5C As shown, the light guide portion 25 includes a first section 2521 and a second section 2522 connected thereto. Along the first axis 24 , the cross section of the first section 2521 increases faster than that of the second section 2522 .

[0090] The structural characteristics of the light guide portion for light transmission and adjustment can be reflected by changes in its cross section and / or described by the characteristics of its longitudinal section (horizontal longitudinal section and / or vertical longitudinal section).

[0091] The light guide portion 25 has a cross section 251 in a direction perpendicular to the first axis 24, and the edge profile of the cross section is a polygon, such as a triangle, a quadrilateral, a pentagon, etc. The cross section 251 can be a symmetrical figure or an asymmetrical figure; in the direction along the first axis 24 toward the distal end 23, the light guide portion 25 has a larger cross section 251 ', such as Figure 3 This means that the cross-section of the light-guiding portion 25 closer to the distal end 23 is larger than the cross-section closer to the proximal end 21. The cross-section may increase gradually or discontinuously. In the longitudinal direction along the first axis 24, the light-guiding portion 25 has a vertical longitudinal cross-section, i.e., a cross-section along the first axis in the vertical direction. In the vertical longitudinal cross-section, the light-guiding portion includes a portion having an open-shaped profile that gradually increases along the first axis toward the distal end.

[0092] In the horizontal direction along the first axis 24, the light guide portion 25 also has a horizontal longitudinal cross-section, that is, a cross-section along the first axis in the horizontal direction. In the horizontal longitudinal cross-section, the light guide portion may include a portion having a uniform profile that remains constant along the first axis toward the distal end and / or a portion having an opening-shaped profile that gradually increases in size.

[0093] The light guide may be symmetrical or asymmetrical about the first axis.

[0094] The light guide can be either a solid structure or a hollow channel. The key point is that the light entering the light guide from the light source assembly 1 is mainly reflected at the interface or inner wall, so that the light is mixed after multiple reflections. The mixed light is then emitted from the light guide into the second optical assembly. Therefore, whether it is a solid structure or a hollow channel, the light guide has a cross-sectional and longitudinal section, such as Figure 6A 、 6B 6C exemplarily show the implementation of the longitudinal cross-section of the light guide portion, and these examples of variations are applicable to light guide portions with solid structures and hollow channels. Figure 6A 、 6B 6C show the longitudinal section (horizontal longitudinal section and / or vertical longitudinal section) of the light-guiding portion along the first axis 24. According to the design concept of the present invention, those skilled in the art may also adopt other similar methods to determine the implementation method of the horizontal and / or vertical longitudinal section.

[0095] In the longitudinal direction of the first axis 24, the light guide portion 25 has a longitudinal cross section; in the longitudinal cross section, the light guide portion 25 includes a section 252, and the section 252 has an open profile that gradually increases in size along the first axis 24 toward the distal end 23. Figure 6A 、 6B and 6C.

[0096] The opening-shaped profile of the longitudinal cross-section of the light guide portion 25 gradually increases in size, which can be linear or nonlinear, and is therefore represented by dashed lines. That is, the dashed lines do not limit the upper and lower edges of the longitudinal cross-section to straight lines. The upper and lower edges of the longitudinal cross-section can be straight lines, quadratic curves, or one or more of the above.

[0097] The segment 252 may be a portion of the light guide 25 .

[0098] One end of the segment 252 is located at the proximal end 21 of the first optical component 2, and the other end is located at the middle section 22. Figure 6A shown.

[0099] The segment 252 may also be the entire light guide portion 25 .

[0100] like Figure 6B As shown, the longitudinal cross-section of the light guide portion 25 gradually increases in size from the proximal end 21 to the distal end 23 along the first axis 24 .

[0101] In the direction along the first axis 24 toward the distal end 23, the light guiding portion 25 has at least two segments connected to each other, and the at least two segments satisfy: the longitudinal cross-section of at least one segment in the at least two segments has an opening-type profile that increases linearly or nonlinearly; and, in the at least two segments, the opening growth rate of the opening-type profile of the longitudinal cross-section of each segment is partially the same or different, for example, the longitudinal cross-section of the segment closer to the end 21 may have an opening-type profile with a faster opening increase.

[0102] For example, the light guide portion 25 includes two sections. Figure 6C As shown, the light guide portion 25 includes a first segment 2521 and a second segment 2522 connected thereto. In the direction along the first axis 24 , the opening of the first segment 2521 increases faster than the opening of the second segment 2522 .

[0103] An important difference between outdoor display and indoor display is that in outdoor application scenarios, the viewer is usually far away from the actual presentation location of the displayed information. In outdoor display, in order to allow more viewers to view the displayed information from a farther distance, the display device, such as the display screen, is usually placed at a certain height. Figure 7 In order to improve the light source efficiency and display effect, it is necessary to adjust the light distribution according to the actual position of the viewer so that the emitted light is more distributed in the viewer's sight area.

[0104] When the first axis 24 of the light guide and the second axis 33 of the lens are parallel and located in the same horizontal plane, as shown in FIG. Figure 8A As shown, when the first axis 24 of the light guide is parallel to and horizontally higher than the second axis 33 of the lens, as shown in FIG. Figure 8B In order to illustrate the effect of the first axis 24 being parallel and higher than the second axis 33 on the emitted light, a special light emitted from the light source assembly 1 is selected to observe the difference. The light emitted from the light source assembly 1 and coinciding with the first axis 24 is selected, as shown in FIG. Figure 8A As shown, according to the principle of the lens, since the light coincides with the axis of the lens in the horizontal direction, it is emitted from the lens along the axis of the lens, that is, in the horizontal direction; Figure 8B In the example, a light ray emitted from light source assembly 1 and coinciding with first axis 24 is selected. When the light ray reaches the second surface of the lens, since second axis 33 is parallel to and horizontally lower than first axis 24, the light ray is parallel to and horizontally higher than second axis 33. After passing through the second surface of the lens, the light ray is refracted downward. Therefore, when the axis of the light guide is higher than the axis of the lens, at least a portion of the light ray is deflected downward.

[0105] In principle, because a lens has a converging effect, the upper half of the lens above the lens axis will deflect light downward, while the lower half of the lens will deflect light upward. Consequently, more light entering the lens is distributed over the upper half of the lens, which in turn deflects more light downward.

[0106] 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 curved surface with a converging effect in the longitudinal direction of the second axis 33. The portion located above the second axis 33 is called the upper lens, and the portion located below the second axis 33 is called the lower lens. The longitudinal focal length of the upper lens is shorter than the longitudinal focal length of the lower lens, so that more light entering the upper lens is deflected downward and refracted below the second axis 33 after passing through the lens.

[0107] When the upper lens and / or the lower lens has a unique focal length in the longitudinal direction, the focal length should be understood as the unique focal length; when the upper lens and / or the lower lens has multiple focal lengths, the focal length may refer to at least one of the multiple focal lengths, the main focal length of the multiple focal lengths, or the average focal length of the multiple focal lengths.

[0108] Average can be calculated using arithmetic mean, geometric mean, or other average calculation methods.

[0109] The "primary" in "primary focal length" can be understood as a value that plays a major role or is relatively important among multiple values, or it can be understood as a value determined by weighted calculation of multiple values. For example, if the longitudinal cross-section of the upper lens includes five 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 five focal lengths according to their respective weights.

[0110] In an embodiment, Figure 8C and 8DAs shown, the curvature radius of the longitudinal section of the second surface of the upper lens is smaller than the curvature radius of the longitudinal section of the lower lens.

[0111] When the second surface of the upper lens and / or the lower lens has a single radius of curvature in a longitudinal cross-section, the radius of curvature should be understood to refer to the single radius of curvature; when the upper lens and / or the lower lens has two or more radii of curvature in a longitudinal cross-section, the radius of curvature may refer to at least one of the multiple radii of curvature, a principal radius of curvature of the multiple radii of curvature, or an average radius of curvature of the multiple radii of curvature.

[0112] The "principal radius of curvature" can be understood as a value that plays a major role or is relatively important among multiple median values, or it can be understood as a value determined by weighted calculation of multiple values. For example, when the longitudinal cross-section of the upper lens includes five 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 five radii of curvature according to their respective weights.

[0113] When the curvature radius of the longitudinal section of the upper lens is smaller than that of the lower lens, or 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 more downward.

[0114] For example, the longitudinal focal length of the upper lens is smaller than the longitudinal focal length of the lower lens. Figure 8C As shown, the longitudinal focus of the upper lens is F1, and the longitudinal focus of the lower lens is F2, and F1 is closer to the lens than F2. In order to illustrate the influence on the outgoing light when the longitudinal focal length of the upper lens is smaller than the longitudinal focal length of the lower lens, a special emitted light is selected to observe the difference. Assuming that the light emitted from the light source assembly comes from at least one point light source, then the countless light rays emitted from the point light source are reflected multiple times in the light guide, and the light rays passing through the focus F1 and the light rays passing through the focus F2 are selected. According to the lens principle, the light rays emitted from the focus are emitted in the form of parallel beams after passing through the lens. Therefore, the light rays emitted from F1 are emitted in the form of parallel beams after passing through the upper lens, and the light rays emitted from F2 are emitted in the form of parallel beams after passing through the lower lens, as shown in FIG. Figure 8C As shown in the figure, according to lens principles, when light passing through a point on the lens axis between the proximal end 21 and F1 directly strikes the second surface of the lens, the outgoing light will be deflected downward. As can be seen, as F1 moves closer to the lens, the distance between F1 and the proximal end increases, directing more light downward. Similarly, as F2 moves further away from the lens, the distance between F2 and the proximal end decreases, preventing more light from being deflected upward.

[0115] By translating the second axis 33 of the second optical component downwardly in parallel with respect to the first axis 24 of the first optical component, and by making the curvature radius / focal length of the upper lens smaller than the curvature radius / focal length of the lower lens in the longitudinal direction, one of the two methods or a combination of the two methods can achieve more downward deflection of light incident from the first optical component to the second optical component, so that more light enters the viewer's field of view.

[0116] When the first axis 24 is parallel to and above the second axis 33, and the curvature radius / focal length of the upper lens is smaller than the curvature radius / focal length of the lower lens, the light will be further deflected downward, such as Figure 8D As shown, relative to Figure 8C , the light passing through the first axis of the light guiding portion will be deflected downward.

[0117] Another important difference between outdoor and indoor displays is that outdoor displays are more susceptible to external light. When outdoor light is strong, light entering the optical assembly will be refracted and reflected, and some light will be emitted from the optical assembly again into the viewer's field of view, reducing the contrast of the displayed information within the viewer's field of view and affecting the visual effect of the displayed information. Therefore, some method is needed to prevent sunlight from entering the viewer's field of view through the second optical assembly, thereby improving the contrast of the displayed information.

[0118] Considering that outdoor displays are typically installed above the viewer's level, and that sunlight typically originates above the display's level, a shielding structure can be installed above the display to partially block sunlight. However, since sunlight is typically assumed to originate from an infinite distance and enter as parallel light, shielding structures can only block a limited amount of sunlight, thus providing a relatively limited effect.

[0119] Considering that sunlight entering from the second optical component will enter the first optical component after refraction, a light trap can be provided 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 being emitted from the second optical component into the viewer's field of view.

[0120] As the name suggests, light entering a light trap is trapped, thus reducing or eliminating its effect on the light emitted by the light source assembly. Since light itself cannot fall into a trap, trapping should be understood to include, but is not limited to, absorption, reflection, and / or refraction of light in specific directions, as long as it can prevent external light from non-light source assemblies from affecting the light emitted by the light source assembly.

[0121] 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 from entering the first optical component and is then emitted from the second optical component to the visible area again; wherein the first direction includes a direction from above the second axis and forming an acute angle with the second axis; and the visible area includes an area outside the second surface of the second optical component and below the second axis.

[0122] The light traps described herein 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 view. Optical effects can include, but are not limited to, propagation, refraction, reflection, and absorption.

[0123] The light-guiding portion can be a solid structure formed by an isotropic light-guiding material with uniform density; the light trap includes a first reflecting surface provided near the distal end of the light-guiding portion. When external light is incident on the second surface of the second optical component in a first direction and enters the light-guiding portion through the second optical component, at least a portion of the light is reflected at the first reflecting surface and then emitted from the light-guiding portion to a non-visible area outside the optical module, and at least a portion of the light is refracted at the first reflecting surface and then emitted directly from the light-guiding portion to the non-visible area.

[0124] In a longitudinal direction along the first axis, the light guide portion has a longitudinal section; in the longitudinal section, the first reflective surface includes a downwardly opening profile.

[0125] like Figure 9A and 9B As shown, the light-guiding portion 25 is a solid prism structure formed of an isotropic and uniformly dense light-guiding material, having a first axis 24 and a first reflecting surface 253 provided near the distal end 23. In the longitudinal section of the light-guiding portion 25 along the first axis 24, the first reflecting surface 253 includes an open lower profile that increases linearly downward.

[0126] exist Figure 9A 、 9B In the embodiments of the light guide portion with a solid structure shown in Figures 10A to 10E, an intermediate piece 4 is provided between the light guide portion 25 and the second optical component 3 .

[0127] The middle piece 4 can be formed by processing the second optical component 3 and be integrated with the second optical component 3. By processing the middle piece 4, the material of the second optical component 3 can be saved and an end portion that is easy to connect with the distal end 23 of the light guide portion 25 can be constructed.

[0128] The intermediate component 4 and the second optical component 3 can be manufactured by integral injection molding.

[0129] The intermediate component 4 may also be a separate component made of the same material as the second optical component 3 , with one end connected to the distal end 23 of the light guide portion 25 and the other end connected to the first surface 31 of the second optical component 3 .

[0130] The intermediate member 4 may be provided with a light absorbing material on its axial outer wall. The intermediate member 4 may be made of the same material as the light guide 25 , but because the outer wall of the intermediate member 4 is provided with other materials, the intermediate member 4 is different from the light guide 25 .

[0131] 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 25, at least a portion of the light is reflected at the first reflective surface 253 and then emitted to the interface of the light guide 25, where it is refracted and emitted to the non-visible area outside the optical module, such as Figure 9B As shown, and part of the light is reflected at the interface and when it reaches the interface again, it is partially refracted into the non-visible area outside the optical module; and, a part of the light may be refracted at the first reflecting surface and then directly emitted from the light guiding portion to the non-visible area (not shown).

[0132] The first reflective surface can have various deformations, such as Figures 10A-10E shown.

[0133] like Figure 10A As shown, the light trap of the light guide portion 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 can be parallel to the horizontal plane.

[0134] like Figure 10B As shown, the light trap of the light guiding portion 25 includes two planes connected to each other in a direction perpendicular to the axial direction, and the inclination angles of the two planes to the horizontal plane can be the same or different.

[0135] like Figure 10C As shown, the light trap of the light guiding portion 25 includes a plurality of planes connected to each other.

[0136] like Figure 10D As shown, the light trap of the light guiding portion 25 includes a first reflective surface, and a protrusion is provided on the first reflective surface.

[0137] like Figure 10E As shown, the first reflective surface can be provided on the intermediate member 4 . Accordingly, the first reflective surface should be a smooth plane without any other material layer provided on the smooth plane.

[0138] As mentioned above, the light guide portion can also be a hollow channel. The first optical component can include a tubular structure, the tubular structure including an outer wall and an inner wall surrounding a first axis; the light guide portion is a hollow channel formed by the inner wall; the inner wall has a mirror-like property with high reflectivity, and light entering the light guide portion is transmitted in the light guide portion and reflected on the inner wall; the light trap includes a notch structure provided near the distal end of the light guide portion, the notch structure including a channel located below the first axis and extending downward through the inner and outer walls of the first optical component; when external light is incident on the second surface of the second optical component in a first direction and passes through the second optical component into 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.

[0139] Mirror properties can be achieved through coating, electroplating, film lamination and other processes on the inner wall.

[0140] like Figure 11A 、 11B As shown in Figures 11C 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-guiding portion 25 is a hollow channel formed by the inner wall 262. The inner wall 262 has mirror properties, and light entering the light-guiding portion 25 is transmitted in the light-guiding portion 25 and reflected on the inner wall 262. The light trap includes a notch structure 254 provided in the light-guiding portion near the distal end 23. The notch structure 254 includes a channel 2541 located below the first axis 24 and extending downward through the inner wall 262 and the outer wall 261.

[0141] 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, at least a portion of the light is emitted from the channel of the notch structure 254 to the non-visible area outside the optical module. Figure 11B and 11C shown.

[0142] 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 focus of the second optical component in the longitudinal section on the first axis falls as much as possible into the projection area of the channel of the notch structure on the first axis.

[0143] When the second surface of the second optical component has a unique focus in the longitudinal section, the focus should be understood as the unique focus; when the second surface of the second optical component has more than two focuses in the longitudinal section, the focus may refer to at least one focus among the multiple focuses, the main focus of the multiple focuses, or the average focus of the multiple focuses.

[0144] The "primary" in "primary focus" can be understood as a value that plays a major role or is relatively important among multiple values, or it can be understood as a value determined by weighted calculation of multiple values. For example, when the longitudinal cross-section of the upper lens includes five 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 five focal points according to their respective weights.

[0145] When the second optical assembly 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 primarily strikes the lens from a distant area above the second axis at a substantially parallel angle, the notch structure can be configured so that the projection of the focal point of the upper lens of the second optical assembly on the first axis falls as much as possible within the projection area of the channel entrance of the notch structure on the first axis, thereby ensuring that sunlight striking the upper lens is directed as much as possible through the channel of the notch structure to exit the optical module.

[0146] like Figure 12 As shown, the position of the notch structure 254 is set so that the projection of the focus of the second optical component in the longitudinal section on the first axis 24 falls as much as possible into the projection area K of the cross section of the channel of the notch structure on the first axis 24.

[0147] like Figure 12 As shown, the position of the notch structure 254 is set so that the projection of the focus of the upper lens of the second optical component in the longitudinal section on the first axis 24 falls as much as possible into the projection area K of the cross section of the channel of the notch structure on the first axis 24.

[0148] In addition to allowing external light to leave the optical module through the notch structure, another benefit of the notch structure is that it helps to deflect more light from the light source component downward. Figure 13A As shown, when there is no notch structure, the light emitted by the light source assembly and entering the light guide portion 25 will be reflected and refracted upwards when it reaches the lower inner wall 262 near the distal end 23, thus not entering the viewer's effective field of view. Figure 13B As shown, this part of light will be emitted downward from the channel of the notch structure to the lower half of the second optical component, and finally enter the viewer's visible area, thereby enhancing the light extraction efficiency of the visible area.

[0149] External sunlight enters the second optical assembly at a certain angle and in a generally parallel manner from a distant area above the second axis. A portion of the sunlight entering the lower lens is refracted and enters the first optical assembly. To further reduce this portion of sunlight, the notch structure can be further adjusted so that the projection of the focal point of the lower lens of the second optical assembly in a longitudinal cross-section on the first axis 24 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 assembly to be blocked by the notch structure and reflected at the notch structure's channel, thereby exiting through the upper lens.

[0150] If the focus of the lower lens of the second optical component in the longitudinal section is located within the projection area of the notch channel on the first axis, a portion of the external sunlight entering from the lower lens will enter the first optical component through the channel of the notch structure, and 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.

[0151] However, when the second optical component is a symmetrical lens in the longitudinal direction, a contradiction arises: it is impossible to make the projection of the focus of the upper lens fall as much as possible within the projection area of the channel entrance of the notch structure on the first axis, while at the same time making the projection of the focus of the lower lens fall as much as possible outside the projection area.

[0152] Based on this consideration, when the lens has a single focus in the longitudinal section, the focus 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 cross-sectional profile of the channel entrance (e.g., Figure 14C This requires very high precision, which is often difficult to achieve in engineering applications.

[0153] Therefore, to better reduce the amount of external sunlight entering the light guide, the second optical assembly can use asymmetric lenses in the longitudinal direction, so that the projection of the focus of the upper lens of the second optical assembly in the longitudinal cross-section on the first axis falls as far as possible within the projection area of the notch structure's channel on the first axis, and the projection of the focus of the lower lens in the longitudinal cross-section 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 entering the upper lens from above will be directly emitted from the notch channel to the outside of the first optical assembly, while most of the parallel light entering the lower lens will be reflected by the surface of the notch structure's channel.

[0154] In order to further guide the parallel light of the lower lens from the notch structure to the outside of the first optical component, a portion of the surface of the channel of the notch structure constitutes a second reflective surface, which is arranged 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 the first direction and passes through the second optical component into the first optical component, at least a portion of the light is reflected from the second reflective surface and then emitted through the channel to the non-visible area outside the optical module. Figure 14A and 14B shown.

[0155] like Figure 14B As shown, a portion of the surface of the channel of the notch structure 254 constitutes a second reflective surface 255, which is arranged opposite to the second surface 32 of the second optical component and is inclined clockwise at a certain angle relative to the first axis; when sunlight enters the second optical component in a 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.

[0156] like Figure 14C As shown, when the second optical component has a single focus, the focus can be located on a perpendicular line L to 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.

[0157] When the second optical component has a non-unique focal point, the lens can include one or more longitudinally discrete focal points, so that the projections of most focal points on the first axis fall within the projection area K of the channel entrance of the notch structure on the first axis. This allows most sunlight entering the second optical component from the outside to be emitted through the channel of the notch structure. Furthermore, light entering from the lower hemisphere of the lens is focused as much as possible on the second reflective surface of the light trap, which then reflects this light out of the second optical component.

[0158] When the upper and lower lenses have different focal points, the projection of the focus of the upper lens on the first axis can fall within the projection area K of the channel entrance of the notch structure on the first axis, and the focus 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 irradiated on the lower lens is concentrated as much as possible on the second reflection surface of the light trap, so that the second reflection surface reflects this part of the light to the outside of the light guide portion.

[0159] In an embodiment, Figure 14A 、 14BAs shown in Figures 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 asymmetric 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 the first axis 24; the light guide portion 25 is a hollow channel formed by the inner wall 262; the inner wall 262 has mirror properties, and the light guide portion has a rectangular cross-section in a direction perpendicular to the first axis, and the rectangular cross-section gradually increases from the proximal end 21 to the distal end 23 along the first axis; light entering the light guide portion 25 is transmitted in the light guide portion 25 and reflected on the inner wall 262; the light guide portion 25 includes a notch structure 254 provided near the distal end 23 of the light guide portion, the notch structure 254 includes a channel 2541 located below the first axis 24 and downwardly extending 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, which is arranged opposite to the second surface 32 of the second optical component and is inclined clockwise at a certain angle relative to the first axis.

[0160] The curvature radius / focal length of the upper lens of the second optical assembly is smaller than the curvature radius / focal length of the lower lens.

[0161] The first axis 24 of the first optical component is parallel and higher than the second axis 33 of the second optical component.

[0162] The notch structure is configured to ensure that: the projection of the focal point of the upper lens of the second optical assembly in a longitudinal cross-section on the first axis 24 falls as far as possible within 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 assembly in a longitudinal cross-section on the first axis 24 falls as far as possible outside the projection area K of the channel opening of the notch structure on the first axis 24, in a projection area closer to the light source assembly. The channel opening is located where the channel 2541 communicates with the hollow channel of the light guide portion 25.

[0163] The second reflective surface is tilted at an angle such that most of the light incident on the lower hemisphere is reflected at the second reflective surface 255 and then emitted to the non-visible area outside the optical module through the channel.

[0164] When sunlight enters the second optical component and enters the first optical component 2 in the first direction, most of the light entering the upper hemisphere will directly leave the first optical component 2 and be emitted to the non-visible area through the channel 2541 of the notch structure; most of the light entering the lower hemisphere will be reflected at the second reflective surface 255 and then emitted to the non-visible area outside the optical module through the channel.

[0165] The curvature radius of the upper lens can be set to allow sunlight with an inclination angle to the first axis greater than a preset angle (eg, 10 degrees) to be refracted through the upper lens and enter the notch structure.

[0166] The curvature radius of the lower lens can be set to allow sunlight incident from the second lens to be refracted by the upper lens and reflected at the second reflective surface before directly leaving the first optical component and entering the non-visible area.

[0167] In the embodiment, the outer wall profile of the second optical component having a tubular structure is not limited and can be cylindrical, pyramidal, prism-shaped, etc.

[0168] In order to demonstrate the technical effect of the design of the present invention on reducing incident sunlight from being emitted from the visible area, a set of simulation tests were conducted.

[0169] In the simulation software, the optical module was placed horizontally. A set of parallel light beams tilted 10 degrees horizontally simulated sunlight incident on the second optical component. The second optical component used a lens that was asymmetric convex in the vertical direction and symmetrical converging in the horizontal direction. A lighting plane and a receiving sphere were placed in front of the lens. The lighting plane was used to observe the intensity of the light returning from the lens after the parallel light entered, while the receiving sphere was used to observe the intensity of the light emitted by the light source assembly after passing through the lens.

[0170] The following four simulation test examples illustrate the positional relationship between the axes of the first optical component and the second optical component.

[0171] Test Example 1: The first axis of the first optical component coincides horizontally with the second axis of the second optical component, no light trap is provided in the light guide portion of the first optical component, and the focus of the lens is located in the light guide portion of the first optical component.

[0172] Test Example 2: The change with respect to 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.

[0173] Test Example 3: The change relative to 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 focus of the lens is located outside the light-guiding portion and between the first surface and the second surface of the lens. At this time, the distance between the light-guiding portion and the second surface of the lens is increased.

[0174] Test Example 4: Compared with Test Example 2, the change is that a light trap including a reflective surface and a notch structure is provided in the light guiding portion of the first optical component.

[0175] The simulation results are shown in the attached Figure 15A 、 15B, 16A, 16B, 17A, 17B, 18A and 18B, and as shown in Table 1, they correspond to the light emitted after the simulated sunlight enters the optical module of test examples 1-4, and the light emitted by the light source assembly after passing through the first optical assembly and the second optical assembly. Among them, the blue line (or ▲ line) represents the vertical direction, and the green line (or ● line) represents the horizontal direction. The horizontal axis represents the angle. For the vertical direction, when it is less than 0°, it means below the horizontal direction, and when it is greater than 0°, it means above the horizontal direction. For the horizontal direction, the two sides of 0° represent the left and right sides of the axis of the lens respectively; the vertical axis represents the light intensity, and the larger the value, the stronger the light intensity.

[0176] The data results of the four test cases are shown in Table 1, where the light output angle is defined as the position equal to 50% of the light intensity at 0°.

[0177]

[0178] Table 1

[0179] For test case 1:

[0180] The simulation results obtained on the lighting surface and the lighting sphere are as follows: Figure 15A and 15B As shown. Figure 15A The vertical and horizontal light intensities of the light emitted by the simulated sunlight through the optical module are shown. Figure 15B The vertical and horizontal light intensities of the light emitted by the light source assembly after passing through the light guide and the lens are shown. Figure 15A and 15B As shown, since the lens is asymmetric in the longitudinal direction, the light of the simulated sunlight and the light source assembly is strongest between -5° and 0° in the longitudinal direction, and in the horizontal direction, the light of the simulated sunlight and the light source assembly is roughly symmetrical with respect to the axis of the lens.

[0181] As shown in Table 1, the maximum intensity of the simulated sunlight (reflected sunlight) emitted after passing through the optical module is 1.5 cd, while the intensity at the center of the lens is 215 cd. The horizontal light output angle is ±15°, and the vertical light output angle is +9° to -11°.

[0182] When the first axis of the light guide coincides with the second axis of the lens, the horizontal light output angle is symmetrical, and the vertical light output angle is relatively symmetrical. Simulating sunlight entering the lens, the light is refracted and enters the light guide. After multiple reflections in the light guide, at least a portion of the light eventually re-emitted from the lens into the visible area. This portion of the sunlight will appear in the visible area together with the light from the light source, reducing the contrast of the light from the light source and causing poor visibility.

[0183] For test case 2:

[0184] The simulation results obtained on the lighting surface and the lighting sphere are as follows: Figure 16A and 16B As shown. Figure 16A The vertical and horizontal light intensities of the light emitted by the simulated sunlight through the optical module are shown. Figure 16B The vertical and horizontal light intensities of the light emitted by the light source assembly after passing through the light guide and the lens are shown. Figure 16A and 16B As shown, since the first axis of the light-guiding portion is parallel to and higher than the second axis of the lens, in the longitudinal direction, the light output of the simulated sunlight and the light output of the light source assembly are significantly shifted downward, and in the horizontal direction, the light of the simulated sunlight and the light source assembly are still roughly symmetrical relative to the axis of the lens.

[0185] As shown in Table 1, the maximum intensity of the simulated sunlight (reflected sunlight) emitted after passing through the optical module is 0.35 cd, while the intensity at the center of the lens is 190 cd. The horizontal angle of the light is ±15°, and the vertical angle is between +4° and -18°. As can be seen, while other factors remain unchanged and the first axis is set parallel to and above the second axis, the intensity of the simulated sunlight decreases by an order of magnitude. However, after reflection, a significant amount of light still enters the target area.

[0186] For test case 3:

[0187] The simulation results obtained on the lighting surface and the lighting sphere are as follows: Figure 17A and 17B As shown. Figure 17A The vertical and horizontal light intensities of the light emitted by the simulated sunlight through the optical module are shown. Figure 17B The vertical and horizontal light intensities of the light emitted by the light source assembly after passing through the light guide and the lens are shown. Figure 17A and 17B As shown, 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 intensity of the simulated sunlight output further decreases significantly. At the same time, because the focal point is not within the light guide, the light output angle of the light source assembly decreases. Horizontally, the simulated sunlight and the light from the light source assembly remain roughly symmetrical about the axis of the lens.

[0188] As shown in Table 1, the maximum intensity of the simulated sunlight (reflected sunlight) emitted after passing through the optical module is 0.027 cd, while the intensity at the center of the lens is 165 cd. The horizontal light output angle is ±12.5°, and the vertical light output angle is +4° to -15°.

[0189] In Test Example 3, the simulated sunlight does not enter the light guide, which somewhat addresses the contrast reduction issue. However, this causes the focal point to move further away, further reducing the originally designed light output angle. Both the horizontal and vertical light output angles are reduced.

[0190] For test case 4:

[0191] The simulation results obtained on the lighting surface and the lighting sphere are as follows: Figure 18A and 18B As shown. Figure 18A The vertical and horizontal light intensities of the light emitted by the simulated sunlight through the optical module are shown. Figure 18B The vertical and horizontal light intensities of the light emitted by the light source assembly after passing through the light guide and the lens are shown. Figure 18A and 18B As shown, since 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, part of the simulated sunlight is emitted from the light guide through the notch structure of the light trap and does not enter the visible area, while another part of the simulated sunlight is emitted from the reflective surface of the light trap and is reflected, thereby being emitted from the light guide and does not enter the visible area. Figure 18A As shown, the light intensity of the simulated sunlight output shows a significant decrease in the vertical and horizontal directions; in the horizontal direction, the light of the simulated sunlight and the light source assembly is still roughly symmetrical relative to the axis of the lens.

[0192] As shown in Table 1, the maximum intensity of the simulated sunlight (reflected sunlight) emitted after passing through the optical module is 0.0041 cd, while the intensity at the center of the lens is 213 cd. The horizontal light output angle is ±15°, and the vertical light output angle ranges from +3° to -17°.

[0193] In Test Example 4, the light trap's notched structure and second reflective surface effectively prevent sunlight from entering the light-mixing section and reflecting and mixing, enhancing the contrast of the light emitted by the light source assembly. After being refracted by the lens, the simulated sunlight either passes directly through the light trap below the light guide or reflects off the second reflective surface. Only a very small amount of light enters the light guide, and after multiple reflections, most of this light is absorbed by the material, leaving only a small amount visible. The intensity of the simulated sunlight refracted by the lens and then exiting through the curved surface is even lower than in Test Example 3, resulting in superior contrast.

[0194] Furthermore, since the light emitted from the light source is not reflected at the light trap position but is emitted directly from the lower lens, a portion of the light is avoided from being reflected upwards, thus better ensuring the effect of emitting light downwards.

[0195] The present invention further provides a display screen, which includes the aforementioned optical module.

[0196] The present invention further provides a display system, which includes a display screen and a screen control system, wherein the display screen includes the optical module as described above, and the screen control system is used to control the information display action of the display screen.

[0197] The present invention further provides 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.

[0198] 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 by using the contents of the present invention description and drawings under the concept of the present invention, or direct / indirect application in other related technical fields are included in 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: A light source component, for emitting light; The first optical assembly comprises a proximal end proximal to the light source assembly, a distal end distal to the light source assembly, and a midsection extending from the proximal end to the distal end along a first axis; the first optical assembly comprises a light guide portion, the light guide portion receiving light emitted from the light source assembly from the proximal end, the light entering the light guide portion being mixed in the light guide portion and then emitted; The light guiding portion has a cross section in a transverse direction perpendicular to the first axis, and the edge profile of the cross section is polygonal; in a direction along the first axis toward the distal end, the light guiding portion has a same or larger cross section; The second optical component includes a first surface proximal to the distal end of the first optical component and a second surface distal to 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, wherein the curved surface causes the light to exhibit a converging effect in a longitudinal direction along a second axis, wherein the second axis is perpendicular to the first surface and passes through a center point of the first surface.

2. The optical module according to claim 1, wherein: The first axis is parallel to the second axis.

3. The optical module according to claim 2, wherein: The first axis is located above the second axis.

4. The optical module according to claim 1, wherein: The light guiding portion of the first optical component is a solid structure formed of a light guiding material with uniform density.

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

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

7. The optical module according to claim 6, wherein: In a direction along the first axis toward the proximal end, the light guide portion has at least two segments connected to each other, and the at least two segments satisfy: Among the at least two sections, the cross section of the section closer to the proximal end increases faster.

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 open-shaped profile that gradually increases in size along the first axis toward the distal end.

9. The optical module according to claim 8, wherein: In a 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 meet the following two conditions: A longitudinal cross-section of at least one of the at least two portions has a linearly or nonlinearly increasing open profile; Among the at least two parts, the longitudinal section of the part closer to the proximal end has an open-type profile in which the opening increases faster.

10. The optical module according to claim 2 or 3, characterized in that: The light-guiding portion is further 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 from entering the first optical component and is emitted again from the second optical component to the visible area; wherein the first direction includes a direction from above the second axis and forming an acute angle with the second axis; the visible area includes an area outside the second surface of the second optical component and below the second axis.

11. The optical module according to claim 10, wherein: The light guide portion is a solid structure formed by an isotropic light guide material with uniform density. The light trap includes a first reflective surface provided in the light guide portion near the distal end. When external light is incident on 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 then emitted from the light guide portion to a non-visible area outside the optical module. Moreover, at least a portion of the light is refracted at the first reflective surface and then directly emitted from the light guide portion to the non-visible area.

12. The optical module according to claim 11, wherein: In a longitudinal direction along the first axis, the light guide portion has a longitudinal section; in the longitudinal section, the first reflective surface includes an open lower profile that linearly increases downward.

13. The optical module according to claim 10, wherein: The first optical component includes a tubular structure, which includes an outer wall and an inner wall surrounding the first axis; the light guide portion is a hollow channel formed by the inner wall; the inner wall has mirror properties, and light entering the light guide portion is transmitted in the light guide portion and reflected on the inner wall; the light trap includes a notch structure provided in the light guide portion near the distal end, and the notch structure includes a channel located below the first axis and penetrating downwardly 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 into the first optical component, at least a portion of the light is emitted from the channel of the notch structure to the non-visible area outside the optical module.

14. The optical module according to claim 13, wherein: The projection of the focus or main focus corresponding to the convergence effect of the second optical component in the longitudinal direction on the first axis is located in the projection area of the channel of the notch structure on the first axis.

15. The optical module according to claim 13 or 14, wherein: A portion of the surface of the channel of the notch structure constitutes a second reflective surface, and the second reflective surface is arranged 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 into 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, wherein: The second optical component is a converging lens.

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

18. A display screen comprising the optical module according to any one of claims 1 to 17.

19. A display system comprising a display screen and a screen control system, wherein the display screen comprises the optical module according to claims 1-17, and the screen control system is used to control the information display action 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 comprises a display screen equipped with the optical module according to claims 1-17.

Images