LED light-emitting module, indicating lamp and vehicle

Abstract

The invention discloses an LED light-emitting module, an indicating lamp and a vehicle. The LED light-emitting module comprises a circuit board, a cover plate and at least one LED light-emitting unit. Wherein each LED light-emitting unit comprises a lamp bead and a light guide assembly; the lamp beads are electrically connected with the circuit board, and the circuit board is used for controlling the lamp beads to emit light; the light guide assembly is arranged between the cover plate and the lamp bead; each of at least one light-passing part included in the cover plate corresponds to one LED light-emitting unit, and each light-passing part is used for emitting light emitted by the lamp beads; the side wall of the light guide assembly is arranged around the lamp bead, the interior of the side wall is composed of a first part and a second part, the first part is located at the position away from the light passing part and used for reflecting light emitted by the lamp bead, and the second part is located at the position close to the light passing part and used for reducing the light emitted by the lamp bead and emitted from the light passing part. The technical scheme can be applied to the field of vehicles, large-angle light emitted by the indicator lamp can be reduced, and the influence of light leakage of the indicator lamp on driving safety can be reduced.

Description

Technical Field

[0001] This application relates to the field of LED display technology, and more specifically, to an LED light-emitting module, indicator light, and vehicle. Background Technology

[0002] The lights on a car's instrument panel play a crucial role in informing the driver about the vehicle's status. Instrument panel lights include three categories: indicator lights, warning lights, and malfunction lights. Different lights indicate different vehicle conditions and safety statuses. Light-emitting diode (LED) displays have been widely used in vehicle instrument panels in recent years due to their advantages such as high brightness, high luminous efficiency, vibrant colors, high contrast, wide operating temperature range, short response time, and low energy consumption.

[0003] An LED instrument panel mainly consists of an LED light panel and a cover plate. The cover plate is usually coated with an opaque layer to create a light-transmitting area for specific icon shapes. The LED light panel includes a light guide component, allowing the light emitted by the LED beads to exit through the light-transmitting area, thus displaying the shape of the specific icon. When the LED beads emit light, they produce light at different angles. After being reflected by the LED light guide component, this light is emitted at different angles. Inevitably, some of these rays will have larger angles (such as an angle greater than 60° with the main axis of the beam). These rays, after being reflected by the windshield, may enter the driver's eyes, thus affecting driving safety.

[0004] Therefore, a solution that can reduce the impact of large-angle light on driving is urgently needed. Summary of the Invention

[0005] This application provides an LED light-emitting module, indicator light, and vehicle, which can reduce the large-angle light emitted by the LED light-emitting module, thereby mitigating light leakage. When the LED light-emitting module is applied to a vehicle dashboard, it helps to reduce the impact of indicator light leakage on driving safety.

[0006] In a first aspect, an LED light-emitting module is provided, comprising a circuit board, a cover plate, and at least one LED light-emitting unit. Wherein:

[0007] Each LED light-emitting unit in at least one LED light-emitting unit includes an LED chip and a light guide assembly;

[0008] The LED beads are electrically connected to the circuit board, which is used to control the LED beads to emit light.

[0009] The light guide assembly is positioned between the cover plate and the LED beads;

[0010] The cover plate includes at least one light-transmitting portion, each of the at least one light-transmitting portion corresponding to one of the at least one LED light-emitting units, and each light-transmitting portion is used for the emission of light emitted by the LED light bead;

[0011] The axis of the light guide assembly is perpendicular to the plane where the LED is located, and the sidewall of the light guide assembly is arranged around the LED. The interior of the sidewall is composed of a first part and a second part. The first part is located away from the light-transmitting part in a first direction and is used to reflect the light emitted by the LED. The second part is located close to the light-transmitting part in the first direction and is used to reduce the light emitted by the LED from the light-transmitting part. The first direction is a direction parallel to the axis of the light guide assembly.

[0012] In the above technical solution, by setting a second part inside the sidewall of the light guide component near the light-transmitting part, the angle of the light emitted from the light-transmitting part can be controlled. More specifically, since the second part is located close to the light-transmitting part, generally, some of the light incident on the corresponding position of the second part will be emitted at a large angle. In this application, the second part is set to absorb light, so that most of the light incident on the corresponding position of the second part can be absorbed by the second part and thus cannot be emitted, thereby suppressing the emission of large-angle light. Furthermore, the above technical solution has a high degree of compatibility with the structure of currently widely used LED light-emitting components, which helps to achieve product compatibility.

[0013] In some implementations, the circuit board in this application can be a rigid circuit board, such as a printed circuit board (PCB); or, the circuit board in this application can also be a flexible circuit board, such as a flexible printed circuit board (FPCB or FPC). Flexible circuit boards are also known as flexographic circuit boards, flexible boards, etc.

[0014] In practical implementation, the LED light-emitting module also includes an outer frame, which is disposed outside at least one LED light-emitting unit and surrounds it. In one example, a circuit board can be disposed between at least one LED light-emitting unit and the outer frame, and LED beads can be disposed on the surface of the circuit board; in another example, the circuit board can be disposed outside the outer frame, and the LED beads are connected to the circuit board via wires that pass through the outer frame and are connected at both ends to the LED beads and the circuit board, respectively.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the maximum emission angle of the light emitted by the LED bead is determined based on the first distance and the diameter of the largest circle corresponding to the light-transmitting portion. The first distance is the distance between the first plane and the second plane. The first plane is the plane on the side of the cover plate away from the circuit board. The second plane is the plane where the first portion and the second portion meet.

[0016] In the above technical solution, a portion of the light emitted by the LED bead can be reflected by the first part of the light guide component and exit from the light-transmitting part; another portion of the light emitted by the LED bead can be reflected by the first part of the light guide component and absorbed by the non-light-transmitting part of the cover plate; the remaining portion of the light emitted by the LED bead may be incident on the second part of the light guide component, or may be reflected by the first part of the light guide component and thus incident on the second part, and thus absorbed by the second part; therefore, by designing different light-transmitting part sizes and first distances, the emission angle of the light emitted by the LED light-emitting unit can be controlled.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the relationship between the maximum emission angle, the first distance, and the diameter of the largest circle corresponding to the light-transmitting portion satisfies the following formula:

[0018] θ = arctan(D / H0),

[0019] Where θ is the maximum emission angle, D is the diameter of the largest circle corresponding to the light-transmitting part, and H0 is the first distance.

[0020] In conjunction with the first aspect, in some implementations of the first aspect, the first included angle between the first part and the plane where the LED bead is located is greater than or equal to 90° and less than or equal to 100°.

[0021] In the above technical solution, by setting the first part as an inclined plane, light with a larger emission angle can be reflected by the first part and emitted from the light-transmitting part, which can improve the light emission rate (or light emission efficiency) and achieve high light energy utilization of LED beads.

[0022] In conjunction with the first aspect, in some implementations of the first aspect, the first included angle is greater than or equal to 95° and less than or equal to 97°.

[0023] In the above technical solution, setting the first included angle between 95° and 97° helps to maximize the light energy utilization of LED beads.

[0024] In conjunction with the first aspect, in some implementations of the first aspect, the second included angle between the second part and the plane where the LED bead is located is the same as the first included angle.

[0025] In the above technical solution, setting the first included angle and the second included angle to the same angle helps to reduce the processing difficulty of the light guide component, thereby reducing the manufacturing cost of the LED light-emitting module.

[0026] In conjunction with the first aspect, in some implementations of the first aspect, the LED light-emitting module further includes a light-diffusing component, which is disposed between the cover plate and at least one LED light-emitting unit, and is used for light-diffusing.

[0027] In the above technical solution, by setting a uniform light component, the brightness uniformity of the LED light-emitting unit can be improved.

[0028] In conjunction with the first aspect, in some implementations of the first aspect, the light-emitting center of the LED bead, the geometric center of the light-transmitting portion, and the axis of the light guide assembly are located on the same straight line.

[0029] In conjunction with the first aspect, in some implementations of the first aspect, the first part is coated with an anti-reflective coating.

[0030] In the above technical solution, the anti-reflective coating on the first part helps to improve the reflectivity of the first part to light, thereby further improving the light output efficiency of the LED beads.

[0031] Secondly, an LED light-emitting module is provided, which includes a circuit board, a cover plate, and at least one LED light-emitting unit. Wherein:

[0032] Each LED light-emitting unit in at least one LED light-emitting unit includes an LED chip and a light guide assembly;

[0033] The LED beads are electrically connected to the circuit board, which is used to control the LED beads to emit light.

[0034] The light guide assembly is positioned between the cover plate and the LED beads;

[0035] The cover plate includes at least one light-transmitting portion, each of the at least one light-transmitting portion corresponding to one of the at least one LED light-emitting units, and each light-transmitting portion is used for the emission of light emitted by the LED light bead;

[0036] The axis of the light guide component is perpendicular to the plane where the LED is located, and the sidewall of the light guide component is arranged around the LED. The first section of the sidewall coincides with a part of the quadratic curve. The axis of the light guide component is located at the first section. One focus of the quadratic curve is located at the light-emitting center of the LED. The other focus of the quadratic curve is located on the side of the cover plate away from at least one LED light-emitting unit. The sidewall is used to reflect the light emitted by the LED.

[0037] In the above technical solution, by setting the sidewall of the light guide component to a quadratic surface shape, the angle of the light emitted from the LED light-emitting unit can be controlled by adjusting the focal position of the quadratic surface. Furthermore, this technical solution achieves high luminous energy utilization of the LED chips.

[0038] In conjunction with the second aspect, in some implementations of the second aspect, the maximum emission angle of the light emitted by the LED bead is determined based on the focal length of the quadratic curve, the diameter of the largest circle corresponding to the light-transmitting part, and the second distance, which is the distance between the third plane and the fourth plane. The third plane is the plane on the side of the cover plate away from at least one LED light-emitting unit, and the fourth plane is the plane on the light-emitting center of the LED bead.

[0039] In conjunction with the second aspect, in some implementations of the second aspect, the relationship between the maximum emission angle, the focal length of the conic section, the diameter of the maximum circle corresponding to the light-transmitting portion, and the second distance satisfies the following formula:

[0040] θ = arctan(D / (4f-2H1)),

[0041] Where θ is the maximum exit angle, D is the diameter of the maximum circle corresponding to the light-transmitting part, f is half the focal length of the quadratic curve, and H1 is the second distance.

[0042] In conjunction with the second aspect, in some implementations of the second aspect, the light guide component is a lens with a first cross-section that is partly a quadratic curve shape, the LED beads are embedded in the lens, and the sidewalls of the lens are coated with an anti-reflective film.

[0043] In the above technical solution, the lens can improve the uniformity of the light emitted by the LED light-emitting unit and can achieve the convergence of light, thereby further improving the light energy utilization rate of the LED lamp beads.

[0044] In conjunction with the second aspect, in some implementations of the second aspect, the LED light-emitting module further includes a light-diffusing component, which is disposed between the cover plate and at least one LED light-emitting unit, and is used for light-diffusing.

[0045] In conjunction with the second aspect, in some implementations of the second aspect, the light-emitting center of the LED bead, the geometric center of the light-transmitting part, and the axis of the light guide assembly are located on the same straight line.

[0046] Thirdly, an indicator light is provided, which includes an LED light-emitting module in either the first or second possible implementation.

[0047] Fourthly, a vehicle is provided that includes an LED light-emitting module as in any possible implementation of the first or second aspect, or that includes an indicator light as in any possible implementation of the third aspect.

[0048] For the beneficial effects not described in detail in the second to fourth aspects, please refer to the description in the first aspect, which will not be repeated here. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the optical path of a portion of the light rays in an LED beam;

[0050] Figure 2 This is a cross-sectional view of the LED light-emitting module provided in the embodiments of this application;

[0051] Figure 3 This is a top view of the LED light-emitting unit provided in the embodiment of this application;

[0052] Figure 4 This is a schematic diagram of the optical path in the LED light-emitting unit provided in the embodiments of this application;

[0053] Figure 5 This is a cross-sectional view of another LED light-emitting module provided in the embodiments of this application;

[0054] Figure 6 This is a schematic diagram of the optical path in another LED light-emitting unit provided in the embodiments of this application;

[0055] Figure 7 This is a schematic diagram of the optical path in another LED light-emitting unit provided in an embodiment of this application;

[0056] Figure 8 This is a cross-sectional view of another LED light-emitting module provided in the embodiments of this application;

[0057] Figure 9 This is a schematic diagram of the optical path in another LED light-emitting unit provided in an embodiment of this application;

[0058] Figure 10 This is a schematic diagram of an indicator light provided in an embodiment of this application;

[0059] Figure 11 This is a schematic diagram of a vehicle provided in an embodiment of this application. Detailed Implementation

[0060] To facilitate understanding of the technical solution of this application, the concepts involved in this application are introduced below.

[0061] 1. Beam angle: This refers to the angle at which the light from an LED light source scatters. Generally, the beam angle is the angle formed by the boundary of 50% of the light intensity on both sides of the main axis of the beam. The larger the beam angle, the lower the central light intensity and the softer the light spot; conversely, the smaller the beam angle, the higher the central light intensity and the harsher the light spot.

[0062] 2. Emission angle: also known as the light emission angle, is the angle between the light emitted by the LED beads in the LED light-emitting module and the main axis of the LED beam.

[0063] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0064] As mentioned above, when an LED light bead emits light, its beam contains light rays with different scattering angles. These rays are reflected by the light guide component and emitted at different exit angles. For example... Figure 1 As shown, light rays with a larger exit angle in the LED beam, reflected by the windshield, may enter the driver's eyes; conversely, light rays with a smaller exit angle may directly enter the driver's eyes. These rays can impair the driver's vision at night, thus affecting driving safety. Furthermore, the brightness of the portion of the LED beam closer to the main axis is higher, while the brightness of the portion farther from the main axis is lower. This results in uneven brightness after the LED beam passes through the cover plate. Uneven brightness can prolong the driver's observation time, distracting their attention and thus affecting driving safety.

[0065] In view of this, embodiments of this application provide an LED light-emitting module, an indicator light, and a vehicle. By designing the light guide component of the LED light-emitting module, the emission angle of the LED beam can be controlled, thereby avoiding the LED beads from emitting light with a large emission angle. This can improve the light leakage of the indicator light and reduce the impact of light with a large emission angle on driving from the source.

[0066] Figure 2 A cross-sectional view of an LED light-emitting module provided in an embodiment of this application is shown. Figure 2 As shown, the LED light-emitting module includes a cover plate 10, a circuit board 40, and at least one LED light-emitting unit. The relationship between the various parts of the LED light-emitting module is as follows:

[0067] 1) Each LED light-emitting unit in at least one LED light-emitting unit includes an LED chip 30 and a light guide assembly 20. The LED chip is electrically connected to a circuit board 40, which is used to control the light emission of the LED chip. For example, the circuit board 40 can control the brightness, color, etc. of the LED chip 30.

[0068] For example, the circuit board can be a rigid circuit board, such as a PCB; or it can be a flexible circuit board, such as an FPC.

[0069] In practical implementation, the LED light-emitting module also includes an outer frame 50, which is disposed outside at least one LED light-emitting unit and surrounds it. In one example, such as... Figure 2 As shown in (a), the circuit board 40 can be disposed between at least one LED light-emitting unit and the outer frame 50, and the LED beads 30 can be disposed on the surface of the circuit board 40; in another example, as Figure 2 As shown in (b), the circuit board 40 can be disposed outside the outer frame 50. The LED beads 30 are connected to the circuit board 40 via wires that pass through the outer frame 50 and are connected at both ends to the LED beads 30 and the circuit board 40, respectively. It should be understood that... Figure 2 The connection between the circuit board 40 and the LED beads shown in (b) is only an illustrative example. In actual implementation, there is only one or a set of wires connecting the multiple LED beads 30 inside the outer frame 50 and the circuit board 40 outside. The one or a set of wires passes through a hole in the outer frame 50.

[0070] 2) The light guide assembly 20 is disposed between the cover plate 10 and the LED lamp bead 30. The cover plate 10 includes at least one light-transmitting portion. Each light-transmitting portion 12 in the at least one light-transmitting portion corresponds to one of the LED light-emitting units in the at least one LED light-emitting unit. Each light-transmitting portion 12 is used for the emission of light emitted by the LED lamp bead 30.

[0071] 3) The axis of the light guide assembly 20 is perpendicular to the plane where the LED bead 30 is located, and the sidewall of the light guide assembly 20 is arranged around the LED bead 30. The interior of the sidewall faces the LED bead 30. The interior of the sidewall is composed of a first part and a second part. The first part is located away from the light transmission part 12 in the first direction. The first part is used to reflect the light emitted by the LED bead 30. The second part is located close to the light transmission part 12 in the first direction. The second part is used to reduce the light emitted by the LED bead 30 emitted from the light transmission part 12. The first direction is a direction parallel to the axis of the light guide assembly 20.

[0072] For example, the first direction can be Figure 2 The second part, shown in the z-direction, can be... Figure 2 The portion shown has the light-absorbing layer 21. The first portion is the remaining portion of the sidewall interior excluding the portion with the light-absorbing layer 21. The light-absorbing layer 21 can be a light-absorbing ink or other light-absorbing material. In some implementations, an anti-reflective coating can be deposited on the first portion to improve its light reflectivity, thereby increasing light energy utilization.

[0073] For example, the sidewalls of the light guide assembly 20 are closed structures, such as... Figure 3As shown, the interior of the sidewall of the light guide component 20 can be cylindrical, while the exterior can be a quadrangular prism, or other shapes. The sidewall of the light guide component 20 surrounds the LED bead 30, which can be understood as the LED bead 30 being positioned in a hollow area inside the light guide component 20. It should be noted that the interior of the sidewall of the light guide component 20 can also be a polygonal prism, or other shapes.

[0074] In some implementation methods, combined Figure 2 The maximum emission angle of the light emitted by the LED bead 30 is determined based on the first distance and the diameter of the corresponding largest circle of the light-transmitting portion 12. The first distance is the distance between the first plane and the second plane; the first plane is the plane containing the surface of the cover plate 10 away from at least one LED light-emitting unit; and the second plane is the plane where the first and second portions meet.

[0075] For example, the shape of the light-transmitting portion 12 can be rectangular or circular. When the shape of the light-transmitting portion 12 is circular, the corresponding largest circle of the light-transmitting portion 12 is the circle itself, such as... Figure 3 In the diagram (a), circle 1 is represented by a rectangle. The diameter of the largest circle corresponding to the light-transmitting portion 12 is the diameter of circle 1. If the shape of the light-transmitting portion 12 is rectangular, and the rectangle is a square, the largest circle corresponding to the light-transmitting portion 12 is the inscribed circle of that square, such as... Figure 3 The diameter of the largest circle corresponding to the light-transmitting portion 12, as shown in (b), is the diameter of the inscribed circle. When the rectangle is a rectangle, the largest circle corresponding to the light-transmitting portion 12 is a circle with the width of the rectangle as its diameter, such as... Figure 3 As shown in (c) above, the diameter of the largest circle corresponding to the light-transmitting part 12 is the diameter of circle 2 (i.e., the width of the rectangle). In actual implementation, the shape of the light-transmitting part 12 can also be other shapes, such as polygons, in which case the largest circle corresponding to the light-transmitting part 12 can be the largest inscribed circle of the polygon.

[0076] It should be noted that, Figure 3 Taking the cylindrical shape of the inner sidewall of the light guide component 20 as an example, in actual implementation, the inner sidewall of the light guide component 20 can have other shapes. Furthermore, when viewed from above the LED light-emitting module (i.e., from the direction of the LED bead 30 away from the cover plate 10), the inner sidewall of the light guide component 20 may not be visible, or only a portion of the inner sidewall of the light guide component 20 may be visible. For example, as... Figure 3 As shown in (c), due to the relatively large size of the light-transmitting portion 12, a portion of the interior of the sidewall of the light guide assembly 20 is visible.

[0077] like Figure 4As shown, plane 1 can be regarded as an example of the first plane mentioned above, and plane 2 can be regarded as an example of the second plane mentioned above. That is, the distance between plane 1 and plane 2 is the first distance (H0), and D is the diameter of the largest circle corresponding to the light-transmitting part 12.

[0078] More specifically, the relationship between the maximum emission angle θ, the first distance, and the diameter of the light-transmitting portion satisfies the following formula (1):

[0079] θ=arctan(D / H0), (1)

[0080] For example, if the diameter D of the largest circle corresponding to the light-transmitting part is 1cm and the maximum emission angle θ needs to be controlled to be 45°, then the first distance H0 is 1cm; if the diameter D of the light-transmitting part is 1.5cm and the maximum emission angle θ needs to be controlled to be 45°, then the first distance H0 is 1.5cm.

[0081] from Figure 4 As can be seen from the light path shown, some light rays with larger scattering angles (or emission angles) (such as light ray 1) are reflected by the first part of the light guide component 20 and then incident on the second part of the light guide component 20 (i.e., the light-absorbing layer 21) and are absorbed, thus not escaping from the light-transmitting part 12 of the cover plate 10; some light rays with smaller scattering angles (such as light ray 2) directly incident on the second part of the light guide component 20 and are absorbed; other light rays with even smaller scattering angles (such as light ray 3) can directly exit from the light-transmitting part 12 of the cover plate 10. Therefore, through... Figure 2 The LED light-emitting module shown can control the light emission angle to within the maximum emission angle θ, which can prevent the LED light-emitting module from producing light with a larger emission angle. This reduces the probability of LED light entering the driver's eyes after being reflected by the windshield, thereby improving driving safety.

[0082] from Figure 4 As can be seen from the optical path shown, Figures 2 to 4 The structure of the light guide component 20 shown may result in excessive light absorption by the light-absorbing layer 21, leading to low utilization of the LED light. To improve the utilization of the LED light, this application embodiment designs a light guide component 20 with an inclined inner wall. In one example, such as... Figure 5 and Figure 6 As shown, the first included angle between the first part of the light guide assembly 20 and the plane where the circuit board 40 is located is greater than 90° and less than or equal to 100°, that is... Figure 6 The included angle α (an example of the first included angle) shown is greater than 90° and less than or equal to 100°; the second portion of the light guide assembly 20 is perpendicular to the plane of the circuit board 40. In another example, such as... Figure 7As shown, the angle between the first and second portions of the light guide assembly 20 and the plane where the circuit board 40 is located is the same. Figure 6 and Figure 7 As shown in the optical path, after the reflective portion (i.e., the first portion) of the light guide assembly 20 is tilted, some light rays with larger scattering angles (such as light ray 1) can be directly emitted from the light-transmitting portion 12 of the cover plate 10 after being reflected by the first portion, and... Figures 2 to 4 Compared to the light guide structure shown, the utilization rate of LED lights is improved.

[0083] In some implementations, the first included angle between the first part of the light guide component 20 and the plane where the circuit board 40 is located is greater than or equal to 95° and less than or equal to 97°, so as to maximize the light energy utilization.

[0084] It should be noted that in actual implementation, Figures 2 to 7 The thickness of the light-absorbing layer 21 shown is on the order of micrometers or millimeters, meaning there is no visible height difference (or thickness difference) between the portion with the light-absorbing layer 21 and the portion without it. Figures 2 to 7 The height difference (or thickness difference) between the portion with light-absorbing layer 21 and the portion without light-absorbing layer 21 shown is only for ease of understanding.

[0085] Figure 8 A cross-sectional view of another LED light-emitting module provided in an embodiment of this application is shown. Figure 8 As shown, the LED light-emitting module includes a circuit board 40, a cover plate 10, and at least one LED light-emitting unit. Each of the at least one LED light-emitting unit includes an LED bead 30 and a light guide assembly 20. The LED bead 30 is electrically connected to the circuit board 40, which controls the LED bead 30 to emit light. The light guide assembly 20 is disposed between the cover plate 10 and the LED bead 30. The cover plate 10 includes at least one light-transmitting portion, each light-transmitting portion 12 corresponding to one of the at least one LED light-emitting units, and each light-transmitting portion is used for emitting light emitted by the LED bead 30. The axis of the light guide assembly 20 is perpendicular to the plane where the LED bead 30 is located, and the sidewall of the light guide assembly 20 is disposed around the LED bead 30. A first cross-section of the sidewall coincides with a portion of a quadratic curve, the axis of the light guide assembly is located at the first cross-section, one focus of the quadratic curve is located at the light-emitting center of the LED bead 30, and the other focus of the quadratic curve is located on the side of the cover plate 10 away from the at least one LED light-emitting unit. The sidewall is used to reflect the light emitted by the LED bead.

[0086] The first cross section can be understood as the plane of symmetry of the light guide component 20. This quadratic curve can be a parabola, and the corresponding quadratic surface inside the light guide component 20 can be an ellipsoid or a parabola.

[0087] It should be noted that the circuit board 40 in this embodiment can also be disposed outside the outer frame 50. For more detailed information on the arrangement and type of the circuit board 40, please refer to the description in the foregoing embodiments, which will not be repeated here.

[0088] In some implementations, the filament of the LED bead 30 can be dot-shaped (or spherical), or strip-shaped, or other shapes. The light-emitting center of the LED bead 30 can be the geometric center of the filament, or it can be the part of the LED bead 30 where the energy or luminous efficiency is most concentrated.

[0089] It is understandable that when the medium between the two foci is homogeneous (i.e., the refractive index remains constant or changes very little), light rays passing through one focal point of a conic section will, after being reflected by the conic section, pass through the other focal point of the same conic section. For example... Figure 9 As shown in (a), focal point F1 and focal point F2 are the two focal points of the quadratic curve. When the medium inside the light guide assembly 20 and the medium outside the cover plate 10 are the same, the light emitted by the LED bead 30 (i.e. focal point F1) will inevitably pass through another focal point F2 after being reflected by the side wall of the light guide assembly 20.

[0090] In some implementations, the maximum emission angle of the light emitted by the LED bead 30 is determined based on the focal length of the quadratic curve, the diameter of the largest circle corresponding to the light-transmitting portion 12, and a second distance. The second distance is the distance between the third plane and the fourth plane. The third plane is the plane containing the surface of the cover plate 10 away from the circuit board 40, and the fourth plane is the plane containing the light-emitting center of the LED bead. The method for determining the diameter of the largest circle corresponding to the light-transmitting portion 12 can be referred to the description in the foregoing embodiments, and will not be repeated here.

[0091] like Figure 9 As shown, plane 3 can be regarded as an example of the third plane mentioned above, and plane 4 can be regarded as an example of the fourth plane mentioned above. That is, the distance between plane 3 and plane 4 is the second distance (H1), D is the diameter of the largest circle corresponding to the light-transmitting part 12, and 2f is the focal length of the quadratic curve.

[0092] More specifically, when the medium inside the light guide assembly 20 and the medium outside the cover plate 10 are the same, the relationship between the maximum emission angle, the focal length of the quadratic curve, the diameter of the maximum circle corresponding to the light-transmitting part, and the second distance satisfies the following formula (2):

[0093] θ=arctan(D / (4f-2H1)), (2)

[0094] For example, if the diameter D is 1cm, the second distance H1 is 1.5cm, and the maximum exit angle θ needs to be controlled at 45°, then the focal length 2f is 2cm; if the diameter D is 1.5cm, the second distance H1 is 2cm, and the maximum exit angle θ needs to be controlled at 45°, then the focal length 2f is 2.5cm.

[0095] In some implementations, the light guide assembly 20 is a lens, which includes an upper surface, a lower surface, and sidewalls. Both the upper and lower surfaces are circular. The cross-section of the lens sidewalls is a portion of a quadratic curve. LED beads 30 are embedded in the lower surface of the lens, and the light-emitting center of the LED beads 30 coincides with the center of the circle on the lower surface of the lens. The center of the circle on the lower surface coincides with one focal point of the quadratic curve, and the other focal point of the quadratic curve is located above the cover plate 10 (i.e., on the side away from the LED beads 30). Furthermore, the sidewalls of the lens are coated with an anti-reflective film to improve the reflectivity of the lens sidewalls, thereby improving light energy utilization.

[0096] For the above implementation method, the maximum emission angle is also related to the refractive index n1 of the lens and the refractive index n0 of the medium on one side of the plane 3 of the cover plate 10. That is, the relationship between the maximum emission angle, the focal length of the quadratic curve, the diameter of the largest circle corresponding to the light-transmitting part, the second distance, n1 and n0 satisfies the following formula (3):

[0097]

[0098] For example, taking air as the medium on one side of plane 3 of cover plate 10, n0 can be approximated as 1, and the refractive index of the lens can be 1.4 to 1.5. Then the optical path emitted by the LED bead 30 can be as follows: Figure 9 As shown in (b) in the figure, θ' is less than θ.

[0099] In some implementations, the LED light-emitting module provided in this application embodiment further includes a light-diffusing component 60, which is disposed between the cover plate 10 and at least one LED light-emitting unit, and is used for light-diffusing.

[0100] In some implementations, in the LED light-emitting module provided in this application embodiment, the light-emitting center of the LED bead 30, the geometric center of the light-transmitting portion, and the axis of the light guide component are located on the same straight line.

[0101] The LED light-emitting module provided in this application, through the structural design of the light guide component, achieves control over the maximum light emission angle, thereby reducing light leakage in the LED light-emitting module. When the LED light-emitting module is applied to a vehicle dashboard, it helps to reduce the impact of indicator light leakage on driving safety.

[0102] This application embodiment also provides an indicator light, which includes the LED light-emitting module in the foregoing embodiments. Exemplarily, Figure 10 A schematic diagram of an indicator light provided in this application is shown. (For example...) Figure 10 As shown, a sticker with a specific pattern (such as a parking light) is affixed to the light-transmitting part of the LED light-emitting unit. When the LED light is emitted, light can escape from the light-transmitting part of the pattern, thus serving as a warning. It should be understood that... Figure 10 The indicator lights shown are for illustrative purposes only. The LED light-emitting module provided in this application embodiment can also be applied to other scenarios.

[0103] This application also provides a terminal device, which may include the above-mentioned LED light-emitting module, or the above-mentioned indicator light.

[0104] Optionally, the terminal device can be a vehicle. In this embodiment, the vehicle is used in a broad sense, including transportation vehicles (such as commercial vehicles, passenger cars, motorcycles, flying cars, trains, etc.), industrial vehicles (such as forklifts, trailers, tractors, etc.), engineering vehicles (such as excavators, bulldozers, cranes, etc.), agricultural equipment (such as lawnmowers, harvesters, etc.), amusement equipment, toy vehicles, etc. This embodiment does not specifically limit the type of vehicle.

[0105] For example, Figure 11 A schematic diagram illustrating the application of the LED light-emitting module provided in this application in a vehicle is shown. Figure 11 As shown, the LED light-emitting module provided in this application can be installed in the dashboard (or instrument panel) for use as an indicator light (as shown in icon 1100). Whether icon 1100 is illuminated or not can be controlled by one LED light-emitting module, or it can be controlled by multiple LED light-emitting modules. For example, whether icon 1100 is illuminated or not can be controlled by two LED light-emitting modules, each light-emitting module including at least two LED light-emitting units.

[0106] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions between the various embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0107] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. In this application, "at least one" means one or more, and "more" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0108] The use of prefixes such as "first" and "second" in this application embodiment is solely for distinguishing different descriptive objects and does not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes to distinguish descriptive objects in this application embodiment does not constitute a limitation on the described objects. The description of the described objects is found in the claims or the context of the embodiments, and the use of such prefixes should not constitute unnecessary restrictions.

[0109] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An LED light-emitting module, characterized in that, Includes a circuit board, a cover plate, and at least one light-emitting diode (LED) unit; wherein, Each of the at least one LED light-emitting unit includes an LED chip and a light guide assembly; The LED beads are electrically connected to the circuit board, and the circuit board is used to control the LED beads to emit light. The light guide component is disposed between the cover plate and the LED beads; The cover plate includes at least one light-transmitting portion, each of the at least one light-transmitting portion corresponding to one of the at least one LED light-emitting units, and each light-transmitting portion is used for the emission of light emitted by the LED light bead; The axis of the light guide component is perpendicular to the plane where the LED is located, and the sidewall of the light guide component is arranged around the LED. The interior of the sidewall is composed of a first part and a second part. The first part is located away from the light-transmitting part in a first direction and is used to reflect the light emitted by the LED. The second part is located close to the light-transmitting part in the first direction and is used to reduce the light emitted by the LED from the light-transmitting part. The first direction is parallel to the axis of the light guide component.

2. The LED light-emitting module according to claim 1, characterized in that, The maximum emission angle of the light emitted by the LED bead is determined based on the first distance and the diameter of the largest circle corresponding to the light-transmitting portion. The first distance is the distance between the first plane and the second plane. The first plane is the plane on the side of the cover plate away from the at least one LED light-emitting unit. The second plane is the plane where the first portion and the second portion meet.

3. The LED light-emitting module according to claim 2, characterized in that, The relationship between the maximum emission angle, the first distance, and the diameter of the largest circle corresponding to the light-transmitting portion satisfies the following formula: θ = arctan(D / H0), Wherein, θ is the maximum emission angle, D is the diameter of the largest circle corresponding to the light-transmitting portion, and H0 is the first distance.

4. The LED light-emitting module according to any one of claims 1 to 3, characterized in that, The first angle between the first part and the plane where the LED bead is located is greater than or equal to 90° and less than or equal to 100°.

5. The LED light-emitting module according to claim 4, characterized in that, The first included angle is greater than or equal to 95° and less than or equal to 97°.

6. The LED light-emitting module according to claim 4 or 5, characterized in that, The second angle between the second part and the plane where the LED bead is located is the same as the first angle.

7. The LED light-emitting module according to any one of claims 1 to 6, characterized in that, The LED light-emitting module further includes a light-diffusing component, which is disposed between the cover plate and the at least one LED light-emitting unit, and is used for light-diffusing.

8. The LED light-emitting module according to any one of claims 1 to 7, characterized in that, The light-emitting center of the LED bead, the geometric center of the light-transmitting part, and the axis of the light guide assembly are located on the same straight line.

9. The LED light-emitting module according to any one of claims 1 to 8, characterized in that, The first part is coated with an anti-reflective coating.

10. An indicator light, characterized in that, Includes the LED light-emitting module as described in any one of claims 1 to 9.

11. A vehicle, characterized in that, Includes the LED light-emitting module as described in any one of claims 1 to 9, or the indicator light as described in claim 10.

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