Turning type lighting system of head-up display

Abstract

The utility model relates to a turning type lighting system of a head-up display, which comprises an LED lamp panel, a turning type light bar, a lens, a diffusion plate and a screen, the turning type light bar comprises a conical cover body and a refraction cover body which are communicated with each other, the conical cover body is provided with a light inlet, the LED lamp panel is arranged at the light inlet, the refraction cover body is provided with a light outlet, and the LED lamp panel is arranged at the light outlet. The lens is arranged at the light outlet, and the diffusion plate and the screen are sequentially stacked on the side, away from the light outlet, of the lens. And a turning surface is arranged on the refraction cover body, is opposite to the light inlet and the light outlet, and is used for refracting a light source emitted by the LED lamp panel from the light inlet to the light outlet. According to the utility model, the turning type light bar with the closed light cavity is adopted, so that light rays are reflected and overlapped in the light cavity to form uniform light ray distribution matched with the shape of the light outlet, thereby not only improving the installation accuracy, but also having larger light inlet quantity and backlight volume.

Description

Technical Field

[0001] The utility model relates to the field of automotive electronics, and in particular to a head-up display turning type lighting system. Background Art

[0002] Head-up displays, commonly used in automotive electronics, are a technology that projects information into the driver's field of view. The backlighting structure is a key component of a head-up display. Chinese utility model patent publication number CN209028333U discloses a backlight structure for a head-up display. This structure uses a primary total reflection lens to collimate the output light from an LED light source. A secondary matrix lens and a light-guiding curved surface then transmit the collimated light beam to a deflecting reflector, where the reflected light overlaps to evenly distribute the output light. However, in actual application, this patent has been found to have at least the following shortcomings.

[0003] 1. Due to the volume limitations of a single LED light source and a total reflection lens, the backlight emitting surface is small and cannot meet the requirements for wide-viewing angle AR-HUD use. 2. After passing through the total reflection lens, the light source is incident parallel to the matrix lens. The total reflection lens is usually symmetrical on all sides. If the length of the backlight emitting surface needs to be increased, the center of the emitting surface will be bright and the sides will be dark. 3. The turning reflective surface is placed off-axis relative to the light source, total reflection lens, matrix lens, and convex lens, making it difficult to control the assembly errors between the optical components. Utility Model Content

[0004] In view of this, the present invention provides a head-up display turning lighting system that is easy to assemble and has a larger light intake and backlight volume.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A head-up display turning lighting system includes an LED light board, a turning light rod, a lens, a diffuser plate and a screen, the turning light rod includes a conical cover and a refractive cover that are interconnected, the conical cover is provided with a light inlet, the LED light board is arranged at the light inlet, the refractive cover is provided with a light outlet, the lens is arranged at the light outlet, the diffuser plate and the screen are stacked in sequence on the side of the lens away from the light outlet; the refractive cover is provided with a turning surface, the turning surface is opposite to the light inlet and the light outlet, and is used to refract the light source emitted by the LED light board from the light inlet to the light outlet.

[0007] In the above technical solution, the design of the LED light board is adopted to form a surface light source that is evenly distributed to a certain extent, which is then emitted into the conical cover and the refractive cover, and then emitted from the light outlet. The divergence angle of the surface light source is modulated by the principle of total reflection, and the size of the conical cover can be flexibly adjusted, so that the size of the light outlet is no longer restricted; accordingly, the light source distribution intensity of the LED light board can also be adjusted according to actual needs, thereby effectively improving the situation where the center of the light outlet is bright and the two sides are dark.

[0008] In addition, the conical cover is connected to the refractive cover to form a turning light rod with a closed light cavity, so that the light is reflected and overlapped in the light cavity, forming a uniform light distribution that matches the shape of the light outlet. This can effectively avoid problems such as the light spot deviating from the center of the screen or uneven brightness due to assembly errors.

[0009] Optionally, in a possible implementation manner, the light outlet, lens, diffuser plate and screen are coaxially arranged.

[0010] In the above technical solution, since the light outlet, lens, diffuser plate and screen are all on the same axis, the light emitted from the light outlet can pass directly and evenly through the diffuser plate and then be projected onto the screen, effectively avoiding the deflection and scattering of light during transmission, ensuring a more uniform brightness distribution on the screen and improving the visual experience.

[0011] Optionally, in a possible implementation, the conical cover has an open structure at both ends, the smaller opening of the conical cover serves as the light inlet, and the larger opening of the conical cover is connected to the refractive cover.

[0012] In the above technical solution, the design of the conical cover allows light to gradually diffuse along the inner wall of the cone and be guided to the larger opening when entering from a smaller light inlet. This not only enhances the focusing effect of the light, but also ensures that the light can enter the refractive cover more effectively, and can adapt to light sources of different sizes and types. By adjusting the size of the conical cover, it can easily match light sources of different specifications, thereby improving the flexibility and compatibility of the system.

[0013] Optionally, in a possible implementation, the refraction cover includes a refraction plate and light guide plates provided on opposite sides of the refraction plate, and the refraction plate is spaced apart and opposite to the light inlet.

[0014] In the above technical solution, the refraction plate is used to receive light from the conical cover, and cooperates with the light guide plates on both sides thereof to form a cover with only one light outlet, so that the light incident from the LED light panel can be refracted by the refraction plate and evenly emitted from the light outlet, thereby improving the uniformity of light on the screen.

[0015] Optionally, in a possible implementation manner, a surface of the refraction plate opposite to the light inlet is the turning surface, and a reflective film layer is coated on the turning surface.

[0016] In the above technical solution, the provision of a reflective film layer can improve the utilization rate of light and increase the amount of light emitted from the light outlet. The reflective film layer not only reflects light, but also can more finely control the direction, angle and intensity of light according to the characteristics and design of the film layer, which helps to achieve a more uniform light distribution and improve the lighting quality.

[0017] Optionally, in a possible implementation, the turning surface is any one of a plane, a concave surface or a convex surface.

[0018] The diverse design of the turning surfaces in this technical solution allows it to flexibly adapt to the needs of various application scenarios. Flat turning surfaces are suitable for scenarios requiring uniform light distribution; concave turning surfaces converge light and reduce the beam divergence angle, making them suitable for applications requiring high-intensity focused lighting; and convex turning surfaces diffuse light and increase the beam divergence angle, making them suitable for scenarios requiring a wide illumination range or a softer lighting effect.

[0019] Optionally, in a possible implementation, the LED light board includes a substrate and a plurality of LED lamp beads electrically connected to the substrate, and the plurality of LED lamp beads are arranged in a rectangular array, a triangular array or a circular array.

[0020] In the above technical solution, the LED lamp beads are arranged in a certain regular pattern to form a surface light source that is evenly distributed at a certain distance. The surface light source can be flexibly adjusted according to actual needs, such as expanding the number of LED lamp beads in the column direction or row direction of the rectangular array to increase the light source distribution intensity in the column direction or row direction, so as to flexibly adapt according to the actual screen size, which can greatly improve the situation where the center of the light-emitting surface is bright and the two sides are dark.

[0021] Optionally, in a possible implementation manner, the lens is a Fresnel mirror, and a surface of the Fresnel mirror opposite to the light outlet is a cylindrical surface.

[0022] In the above technical solution, the Fresnel mirror can collimate the light beam with a certain divergence angle emitted by the turning light rod, thereby increasing its intensity value in a given direction. The setting of the cylindrical surface further improves the collimation of the light, which not only improves the utilization rate of the light, but also makes the lighting effect more concentrated and brighter.

[0023] Optionally, in a possible implementation, the turning light rod and the lens are both made of transparent optical materials.

[0024] In the above technical solution, transparent optical materials can effectively improve light utilization and effectively reduce light scattering and interference during transmission, making the light output more uniform. In addition, transparent optical materials generally have low dispersion, which means that light will not be significantly dispersed due to wavelength differences during transmission.

[0025] Optionally, in a possible implementation manner, the transparent optical material is polycarbonate or polymethyl methacrylate.

[0026] In the above technical solution, both polycarbonate and polymethyl methacrylate have high light transmittance, which means that when light passes through the turning light rods and lenses made of these materials, the loss can be minimized, ensuring the brightness and efficiency of the lighting system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of an embodiment.

[0029] Figure 2 Schematic diagram of the mechanism of a turning light rod according to an embodiment.

[0030] Figure 3 Schematic diagram of the structure of an LED light board according to an embodiment.

[0031] Figure numerals: 1-LED light board; 11-substrate; 12-LED lamp beads; 2-turning light rod; 21-conical cover; 22-refractive cover; 221-refractive plate; 222-light guide plate; 23-light inlet; 24-light outlet; 3-lens; 4-diffuser plate; 5-screen. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0034] Please refer to Figure 1 The present embodiment provides a head-up display turning lighting system, including an LED light board 1, a turning light rod 2, a lens 3, a diffuser 4 and a screen 5. The turning light rod 2 includes a conical cover 21 and a refractive cover 22 that are interconnected. The conical cover 21 is provided with a light inlet 23, the LED light board 1 is provided at the light inlet 23, the refractive cover 22 is provided with a light outlet 24, the lens 3 is provided at the light outlet 24, the diffuser 4 and the screen 5 are stacked in sequence on the side of the lens 3 away from the light outlet 24; the refractive cover 22 is provided with a turning surface, which is opposite to the light inlet 23 and the light outlet 24 and is used to refract the light source emitted by the LED light board 1 from the light inlet 23 to the light outlet 24.

[0035] Specifically, this embodiment takes the horizontally placed conical cover 21 as an example. The conical cover 21 is placed horizontally, the LED light board 1 is fixedly installed at the light inlet 23 and is in a vertical state, the central optical axis of the LED light board 1 is at the center position of the light inlet 23 and is in a horizontal state, and the turning surface is inclined relative to the horizontal plane, that is, it is at a certain angle relative to the horizontal plane. The turning surface is used to receive the light emitted by the LED light board 1 and refract the light to the light outlet 24. In addition, the lens 3, the diffuser plate 4 and the screen 5 are all arranged in a horizontal state.

[0036] This embodiment adopts the design of the LED light board 1 to form a surface light source that is uniformly distributed to a certain extent, which is then emitted into the conical cover 21 and the refractive cover 22, and then emitted from the light outlet 24. The divergence angle of the surface light source is modulated by the principle of total reflection, and the size of the conical cover 21 can be flexibly adjusted. For example, the taper of the conical cover 21 can be flexibly adjusted, so that the size of the light outlet 24 and the backlight surface of the screen 5 are no longer restricted; accordingly, the light source distribution intensity of the LED light board 1 can also be adjusted according to actual needs, thereby effectively improving the situation where the center of the light outlet is bright and the two sides are dark.

[0037] Furthermore, during manufacturing, the conical housing 21 is connected to the refractive housing 22 to form a transitional light bar 2 with a closed optical cavity. This allows light to reflect and overlap within the cavity, resulting in a uniform light distribution that matches the shape of the light outlet 24. This effectively prevents issues such as light spots deviating from the center of the screen 5 or uneven brightness caused by assembly errors. Furthermore, the design of the transitional light bar 2 effectively avoids the splicing marks caused by traditional lens 3 arrays, achieving uniform lighting effects on large display screens. The entire light beam is reflected within the cavity, dividing the original luminous angle into multiple angular channels. However, these channels ultimately overlap at the light outlet 24, greatly improving the uniformity of light propagation.

[0038] It should be noted that in this embodiment, the light outlet 24, lens 3, diffuser 4, and screen 5 are coaxially arranged. This coaxial arrangement facilitates the positioning and installation of the lens 3, diffuser 4, and screen 5. Furthermore, because the light outlet 24, lens 3, diffuser 4, and screen 5 are all on the same axis, light emitted from the light outlet 24 can directly and evenly pass through the diffuser 4 and then be projected onto the screen 5. This effectively avoids deflection and scattering of light during transmission, ensures a more uniform brightness distribution on the screen 5, and enhances the visual experience.

[0039] In this embodiment, the conical cover 21 has an open structure at both ends. The smaller opening of the conical cover 21 serves as the light inlet 23, and the larger opening of the conical cover 21 is connected to the refractive cover 22. Specifically, the conical cover 21 can be a columnar structure with two circular or elliptical bottom surfaces, or a columnar structure with two rectangular bottom surfaces. This embodiment uses two rectangular bottom openings as an example, which is more suitable for the head-up display screen 5. The smaller rectangular opening serves as the light inlet 23, and the larger rectangular opening is connected to the refractive cover 22. The refractive cover 22 is connected to the edge of the larger rectangular opening. This makes the inner cavity of the turning light rod 2 smoother.

[0040] This embodiment adopts the design of a conical cover 21 so that when light enters from a smaller light inlet 23, it can gradually diffuse along the inner wall of the cone and be guided to the larger opening, and the emitted light can be rectangular or other shapes according to actual needs. This not only enhances the focusing effect of the light, but also ensures that the light can enter the refractive cover 22 more effectively, and can adapt to light sources of different sizes and types. By adjusting the size of the conical cover 21, it can easily match light sources of different specifications, thereby improving the flexibility and compatibility of the system.

[0041] In this embodiment, the refractive cover 22 includes a refractive plate 221 and light guide plates 222 disposed on opposite sides of the refractive plate 221. The refractive plates 221 are spaced apart from the light inlet 23. Specifically, taking the refractive cover 22 having two rectangular openings on its bottom surface as an example, the refractive cover 22 is connected to the edge of the larger rectangular opening, with the refractive plate 221 connected to the bottom edge of the rectangular opening, i.e., the longer side, and the two light guide plates 222 connected to the side edges of the rectangular opening, i.e., the two shorter sides.

[0042] The refraction plate 221 of this embodiment is used to receive light from the conical cover 21, and cooperates with the light guide plates 222 on both sides thereof, so that the refraction cover 22 forms a cover with only one light outlet 24, so that the light incident from the LED light board 1 can be refracted by the refraction plate 221 and then uniformly emitted from the light outlet 24, thereby improving the uniformity of light on the screen 5.

[0043] It should be noted that the surface of the refraction plate 221 opposite the light inlet 23 is a turning surface, coated with a reflective film. The reflective film is a metal filter membrane. The provision of the reflective film improves light utilization and increases the amount of light emitted from the light outlet 24. The reflective film not only reflects light but also, based on the film's characteristics and design, allows for more precise control of the light's direction, angle, and intensity, helping to achieve more uniform light distribution and enhance lighting quality.

[0044] In this embodiment, the turning surface can be any of a flat, concave, or convex surface. The diverse design of the turning surface allows this technical solution to flexibly adapt to the needs of various application scenarios. A flat turning surface is suitable for scenarios requiring uniform light distribution; a concave turning surface can converge light and reduce the beam divergence angle, suitable for situations requiring high-intensity focused lighting; a convex turning surface can diffuse light and increase the beam divergence angle, suitable for scenarios requiring a wide lighting range or a soft lighting effect.

[0045] In this embodiment, the LED light board 1 includes a substrate 11 and a plurality of LED beads 12 electrically connected to the substrate 11. The plurality of LED beads 12 are arranged in a rectangular array, a triangular array, or a circular array. The substrate 11 is provided with circuitry and is constructed of aluminum. This allows the LED light board 1 to have a larger heat dissipation area during use, thereby increasing its service life.

[0046] The above-mentioned LED lamp beads 12 are arranged in a certain regular manner to form a surface light source that is evenly distributed at a certain distance. The surface light source can be flexibly adjusted according to actual needs, such as increasing the number of LED lamp beads 12 in the column direction or row direction of the rectangular array to increase the light source distribution intensity in the column direction or row direction, so as to be flexibly adapted according to the actual size of the screen 5. This can greatly improve the situation where the center of the light-emitting surface is bright and the two sides are dark.

[0047] It should be noted that lens 3 in this embodiment is a Fresnel mirror, and the surface of the Fresnel mirror opposite the light outlet 24 is cylindrical. Furthermore, the shape of lens 3 matches the light outlet 24 or screen 5. Typically, a Fresnel mirror has a smooth surface on one side and concentric circular patterns inscribed on the other side, ranging from small to large. The design of these patterns is based on the principles of light interference and diffraction, as well as the requirements of relative sensitivity and reception angle. Each concentric circular pattern (i.e., Fresnel zone) is equivalent to an independent refractive surface, which can converge incident parallel light rays (or light rays at a certain inclination angle) to a common focal point. The cylindrical surface provided in this embodiment can better direct light rays in a given direction, enhancing the light shaping effect in that given direction.

[0048] The Fresnel mirror can collimate the light beam with a certain divergence angle emitted by the turning light rod 2, thereby increasing its intensity value in a given direction. The cylindrical surface further improves the collimation of the light, which not only improves the utilization rate of the light, but also makes the lighting effect more concentrated and brighter.

[0049] In this embodiment, the turning light rod 2 and the lens 3 are both made of a transparent optical material, such as polycarbonate (PC) or polymethyl methacrylate (PMMA).

[0050] The use of transparent optical materials can effectively improve light utilization and reduce light scattering and interference during transmission, resulting in more uniform light output. Furthermore, transparent optical materials typically have low dispersion, meaning that light transmission does not experience significant dispersion due to wavelength differences. Furthermore, polycarbonate and polymethyl methacrylate both have high light transmittance, which minimizes light loss when passing through the turning light rod 2 and lens 3 made of these materials, ensuring the brightness and efficiency of the lighting system.

[0051] It is worth noting that PC is preferred in this embodiment. PC has good stability and will not cause changes in the shape and color of the LED lamp bead 12 due to temperature changes within its operating temperature range.

[0052] It should be noted that diffuser plate 4 expands and evens out the light collected by lens 3, increasing the angle of the light so that uniformity remains essentially constant as the eye moves left and right. Screen 5 is a TFT screen, positioned closely adjacent to diffuser plate 4, parallel to it, and coaxial with it. It receives the backlight system's light beams to display images.

[0053] In the description of the present invention, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0055] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A head-up display turning lighting system, characterized in that: The invention comprises an LED light board, a turning light rod, a lens, a diffuser plate and a screen. The turning light rod comprises a conical cover and a refractive cover which are interconnected. The conical cover is provided with a light inlet. The LED light board is arranged at the light inlet. The refractive cover is provided with a light outlet. The lens is arranged at the light outlet. The diffuser plate and the screen are stacked in sequence on the side of the lens away from the light outlet. The refractive cover is provided with a turning surface which is opposite to the light inlet and the light outlet and is used to refract the light source emitted by the LED light board from the light inlet to the light outlet.

2. The head-up display turning lighting system according to claim 1, characterized in that: The light outlet, lens, diffusion plate and screen are coaxially arranged.

3. The head-up display turning lighting system according to claim 1, characterized in that: The conical cover body is a structure with open openings at both ends. The smaller opening of the conical cover body is the light inlet, and the larger opening of the conical cover body is connected to the refractive cover body.

4. The head-up display turning lighting system according to claim 1, characterized in that: The refraction cover comprises a refraction plate and light guide plates arranged on two opposite sides of the refraction plate, and the refraction plate is spaced apart and opposite to the light inlet.

5. The head-up display turning lighting system according to claim 4, characterized in that: A surface of the refraction plate opposite to the light inlet is the turning surface, and a reflective film layer is plated on the turning surface.

6. The head-up display turning lighting system according to claim 5, characterized in that: The turning surface is any one of a flat surface, a concave surface or a convex surface.

7. The head-up display turning lighting system according to claim 1, characterized in that: The LED light board includes a substrate and a plurality of LED lamp beads electrically connected to the substrate, and the plurality of LED lamp beads are arranged in a rectangular array, a triangular array or a circular array.

8. The head-up display turning lighting system according to claim 1, characterized in that: The lens is a Fresnel mirror, and a surface of the Fresnel mirror opposite to the light outlet is a cylindrical surface.

9. The head-up display turning lighting system according to any one of claims 1 to 8, characterized in that: The turning light rod and the lens are both made of transparent optical materials.

10. The head-up display turning lighting system according to claim 9, characterized in that: The transparent optical material is polycarbonate or polymethyl methacrylate.

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