Light-emitting unit, vehicle lamp and vehicle

Abstract

The present application provides a light-emitting unit, a vehicle lamp and a vehicle, which include: a base; a light-emitting chip, which is arranged on the surface of the base; a protective structure, which covers the surface of the light-emitting chip to isolate the light-emitting chip from the outside, and the middle area of ​​the top surface of the protective structure away from the base is raised; and a containment bracket, which is arranged on the surface of the base and on the periphery of the protective structure.

Description

Technical Field

[0001] The present application relates to the field of vehicle lighting technology, and in particular to an optical module, a vehicle lamp and a vehicle. Background Art

[0002] Car lighting products that use interactive technology have become increasingly widespread. Starting with HiPhi’s interactive lamps, major automobile manufacturers have launched models with interactive lights, such as SAIC Zhiji L7 / LS7 / LS6, Changan Avita 11, etc.

[0003] The latest interactive technology on the market is the interactive technology using LED direct display, which has a small pixel pitch and high definition of displayed images. However, the light source used in the current technology has a low lighting fullness and a certain lighting effect. Therefore, an LED light source with a higher lighting fullness is needed to improve this defect and make the lighting effect of the interactive car lights better. Utility Model Content

[0004] In order to solve the above problems, the technical solutions adopted in the embodiments of the present application are as follows:

[0005] A light emitting unit, comprising:

[0006] Pedestal;

[0007] A light-emitting chip is arranged on the surface of the base;

[0008] A protective structure, covering the surface of the light-emitting chip to isolate the light-emitting chip from the outside, wherein a middle area of ​​the top surface of the protective structure away from the base is raised;

[0009] The enclosure bracket is arranged on the surface of the base and on the periphery of the protection structure.

[0010] The protective structure is convex and not flush with the top surface of the enclosure bracket. The convex shape increases the optical path H of the light in the central area of ​​the light-emitting unit, and the brightness of the light emitted from the top surface of the protective structure corresponding to the area directly above the light-emitting chip decreases, so that the lighting brightness of the area directly above the light-emitting chip is significantly reduced, reducing the difference in light intensity with other angles other than perpendicular to the chip, thereby improving the lighting fullness and uniformity of the overall light-emitting surface of the light-emitting unit, and achieving better lighting effects when used in interactive car lights.

[0011] As an optional implementation, in an embodiment of the utility model, the top surface of the protective structure is a spherical surface, the distance between the top surface of the enclosure bracket and the base surface is d, and the height difference between the highest point in the middle of the top surface of the protective structure and the top surface of the enclosure bracket is h; wherein, h = (20% to 50%) * d.

[0012] As an optional implementation, in the embodiment of the utility model, 0.25mm≤h≤0.68mm, the amount of glue required for the protective structure is J, and 3.8μg≤J≤6.8μg.

[0013] As an optional implementation, in the embodiment of the present utility model, h=0.40 mm, J=4.8 μg.

[0014] As an optional implementation, in the embodiment of the present utility model, the value range of h+d is 0.8-1.2 mm.

[0015] As an optional implementation, in an embodiment of the utility model, the enclosure bracket is made of EMC material, PCT material or ceramic.

[0016] As an optional implementation, in an embodiment of the utility model, the protective structure is epoxy resin or silica gel, mixed with one or more of scattering particles, red phosphor, yellow phosphor, and green phosphor.

[0017] As an optional implementation, in an embodiment of the utility model, the protective structure is formed integrally on the surface of the light-emitting chip, or is formed by dripping in the enclosure bracket.

[0018] A vehicle lamp comprises the light-emitting unit described in any one of the above embodiments.

[0019] The present application also discloses a vehicle, comprising the vehicle light described in any of the aforementioned embodiments.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a light-emitting unit provided in one embodiment of the present application;

[0023] Figure 2 for Figure 1 A side view of the light emitting unit shown;

[0024] Figure 3 for Figure 2 A cross-sectional view of the internal structure of the light-emitting unit shown;

[0025] Figure 4 This is a state diagram when the conventional light-emitting unit is not lit;

[0026] Figure 5 for Figure 4 The state diagram of the conventional light-emitting unit after lighting;

[0027] Figure 6 The actual side view of the light-emitting unit when h = 0.55 mm;

[0028] Figure 7 This is the state diagram when the light-emitting unit is not lit when h = 0.55 mm;

[0029] Figure 8 This is the state diagram after the light-emitting unit is lit when h = 0.55mm;

[0030] Fig. 9 A physical side view of the light-emitting unit when h = 0.65 mm;

[0031] Fig.10 This is the state diagram after the light-emitting unit is lit when h = 0.65mm;

[0032] In the figure: 10, base; 20, light-emitting chip; 30, protection structure; 40, enclosure bracket; 50, bonding wire. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] 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 which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0037] In the description of this application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] When using traditional automotive-grade LED direct-light particles as the direct-display light source of interactive car lights, there is an obvious bright spot in the center after lighting, which makes the highlight area of ​​a single light-emitting unit too small and too concentrated when observed, and the overall lighting effect is poor.

[0040] The applicant found that the fundamental reason for the above situation is that the LED light source chip is small, and the chip light intensity is the highest at the angle perpendicular to the chip, so a bright spot is formed in the center of the light source, and the light intensity at other angles is lower and the fullness is low. For direct display interactive car lights, the entire light-emitting surface of the LED light source is required to be as uniform as possible, and there should be no bright spots as much as possible.

[0041] In order to solve the above problems, the present application provides a light-emitting unit. The light-emitting unit provided in the present application is exemplarily described below:

[0042] As an alternative implementation, see Figure 1-Figure 3 , the present application discloses a light emitting unit, comprising:

[0043] Base 10;

[0044] The light emitting chip 20 is disposed on the surface of the base 10;

[0045] A protection structure 30, covering the surface of the light emitting chip 20 to isolate the light emitting chip 20 from the outside, and a middle area of ​​the top surface of the protection structure 30 away from the base 10 is convex;

[0046] The enclosure bracket 40 is disposed on the surface of the base 10 and on the periphery of the protection structure 30 .

[0047] In this example, in order to optimize the lighting fullness, the protective structure 30 is convex and not flush with the top surface of the enclosure bracket 40. The convex shape increases the optical path H of the light in the central area of ​​the light-emitting unit, and the brightness of the light emitted from the top surface of the protective structure 30 corresponding to the area directly above the light-emitting chip 20 decreases, so that the lighting brightness of the area directly above the light-emitting chip 20 is significantly reduced, reducing the difference in light intensity with other angle areas other than perpendicular to the chip angle, thereby improving the lighting fullness and uniformity of the overall light-emitting surface of the light-emitting unit, and achieving a better lighting effect when applied to interactive vehicle lights.

[0048] The light emitted by the light-emitting chip 20 is scattered on the surface of the surrounding enclosure bracket 40 and then reflected to the protective structure 30 and diverged, which is beneficial to improve the light intensity in other angle areas other than the angle perpendicular to the chip, thereby also helping to improve the fullness of the entire light-emitting unit and the uniformity of the entire light-emitting surface.

[0049] Optionally, the light emitting chip 20 may be a single-electrode or dual-electrode chip, which is fixed to the surface of the base 10 by a crystal-fixing adhesive. The crystal-fixing adhesive is insulating and non-conductive. The light emitting chip 20 is located at a specific position of the base 10 by the crystal-fixing adhesive, which can prevent the light emitting chip 20 from being offset or detached.

[0050] Optionally, the light-emitting chip 20 contains positive and negative pads, which are respectively connected to the corresponding positive and negative electrodes on the base 10 through bonding wires 50. The bonding wire 50 is a kind of wire, usually made of metal material; the base 10 is usually electrically connected to the PCB circuit board. When an external input voltage is connected between the positive and negative electrodes of the base 10, the light-emitting chip 20 is excited by current conduction and emits light of a specific color. Within the current and voltage range that the light-emitting chip 20 can withstand, the greater the current and voltage, the greater the light intensity emitted by the chip after being excited.

[0051] refer to Figure 2In some embodiments, the top surface of the protection structure 30 is a spherical surface. Specifically, the light emitted by the light emitting chip 20 is scattered on the surface of the enclosure bracket 40 and then reflected to the top surface of the protection structure 30 and emitted. In the case where the top surface is a spherical surface, the light emitted from the spherical top surface has a higher degree of divergence, which can improve the brightness uniformity of the light emitting surface.

[0052] refer to Figure 3 In some embodiments, the distance between the top surface of the enclosure bracket 40 and the surface of the base 10 is d, and the height difference between the highest point in the middle of the top surface of the protection structure 30 and the top surface of the enclosure bracket 40 is h, where h = (20% to 50%) * d.

[0053] In the specific operation, after installing the light-emitting chip 20, the mixed colloid is dripped into the recess of the enclosure bracket 40. Through the dosage of the dripped colloid and the process mold control, the glue forms a convex shape after cooling, and is controlled within a certain tolerance, and finally formed into a LED light-emitting unit with a specified convex shape. It has been verified that when this parameter range is used, the light-emitting unit has a higher light fullness and better light effect.

[0054] In some embodiments, 0.25 mm≤h≤0.68 mm, the amount of glue required for the protective structure 30 is J, and 3.8 μg≤J≤6.8 μg.

[0055] In this embodiment, when the dosage J of the added encapsulation colloid is in the range of 3.8μg to 6.8μg, the height difference h between the highest point in the middle of the top surface of the protective structure 30 and the top surface of the enclosure bracket 40 is between 0.25mm and 0.68mm. It has been verified that the luminous fullness of the light-emitting units within this height range is generally high and the light efficiency is good.

[0056] Optionally, h = 0.25 mm, J = 3.8 μg; or h = 0.40 mm, J = 4.8 μg; or h = 0.68 mm, J = 6.8 μg. The dosage J of the encapsulation colloid added has a clear corresponding relationship with the height difference h of the highest point in the middle of the top surface of the protection structure 30 relative to the top surface of the enclosure bracket 40, which is beneficial to the mass production of the light-emitting unit.

[0057] In some embodiments, h = 0.55 mm, J = 6.0 μg. Figure 4 This is a top view of a conventional light-emitting unit when the height difference is 0. From the appearance, it can be seen that the light-emitting chip 20 in the center can be clearly seen when it is not lit. Figure 5 There is a very obvious bright spot in the center of the display, and the light effect is poor; Figure 6-Figure 7 , h = 0.55mm, J = 6.0μg, the light emitting chip 20 in the center is no longer visible when not lit, and the Figure 8 The display shows the fullest luminescence and the highest uniformity; Fig. 9 When the h value and J value are greater than this value, such as h=0.65mm, J=6.3μg, the central brightness will decrease compared to the peripheral brightness and the luminous contrast will increase. This may be because when the height difference h is too large, the optical path of the light in the central area of ​​the light-emitting unit is longer, and it is absorbed and scattered more by the protective structure 30. Finally, the brightness of the light emitted from the top surface of the protective structure 30 is too low, resulting in a greater decrease in the light intensity in the central area, even lower than the light intensity in other angle areas other than the angle perpendicular to the chip. The brightness of the central area is reduced, the overall luminous uniformity of the luminous surface is reduced, and the luminous uniformity gradually decreases.

[0058] In some embodiments, the value range of h+d is 0.8-1.2 mm. The filling height of the protection structure 30 has a great influence on the light path. It has been verified that when the value range of h+d is 0.8-1.2 mm, the optimization effect for lighting is the best.

[0059] In some embodiments, the base 10 is a metal base 10. Specifically, the metal base 10 is a conductive part, which is divided into a positive electrode and a negative electrode. In the accompanying drawings, the shaded part is the metal base 10, which is connected to the positive and negative electrodes of the light-emitting chip 20 through bonding wires 50, respectively, for providing current to the light-emitting chip 20.

[0060] In some embodiments, the enclosure bracket 40 is made of EMC material, PCT material or ceramic. The enclosure bracket 40 is used to protect and seal the light-emitting chip 20. It is non-conductive and can be made of EMC material, PCT material, ceramic, etc. The color is usually white or black. The enclosure bracket 40 presses the positive and negative electrodes of the base 10 from both sides to separate the positive and negative electrodes, preventing the positive and negative electrodes from being directly connected to cause a short circuit.

[0061] In some embodiments, the protective structure 30 is epoxy resin or silicone, mixed with one or more of scattering particles, red phosphor, yellow phosphor, and green phosphor, preferably organic silicone mixed with yellow phosphor and scattering particles. Of course, in other embodiments, other types of particles can be doped, which is not limited here.

[0062] In some embodiments, the protective structure 30 is integrally formed on the surface of the light emitting chip 20, or can be directly dripped into the enclosure bracket 40. During operation, after the light emitting chip 20 is installed, the mixed colloid is dripped into the recess of the enclosure bracket 40, and the glue is cooled to form a convex shape by controlling the dosage of the dripped colloid and the process mold, and finally formed into a LED light emitting unit with a specified convex shape.

[0063] Another aspect of the present application further discloses a vehicle lamp, comprising the light-emitting unit described in any one of the aforementioned embodiments.

[0064] In this case, the protective structure 30 is convex and is not flush with the top surface of the enclosure bracket 40. The convex shape increases the optical path H of the light in the central area of ​​the light-emitting unit, and the brightness of the light emitted from the top surface of the protective structure 30 corresponding to the area directly above the light-emitting chip 20 decreases, so that the lighting brightness of the area directly above the light-emitting chip 20 is significantly reduced, reducing the difference in light intensity with other angle areas other than perpendicular to the chip angle, thereby improving the lighting fullness and uniformity of the overall light-emitting surface of the light-emitting unit, and achieving a better lighting effect when applied to interactive car lights.

[0065] The present application also discloses a vehicle, comprising the vehicle light in any of the aforementioned embodiments.

[0066] The above-mentioned transportation means can be a car, a train, a high-speed train or other transportation means that require a headlight. By using the above-mentioned headlight, the lighting fullness and luminous uniformity are high, and the luminous texture is good.

[0067] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0068] It will be apparent to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present application. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A light emitting unit, characterized in that: include: Pedestal; A light-emitting chip is arranged on the surface of the base; A protective structure, covering the surface of the light-emitting chip to isolate the light-emitting chip from the outside, wherein a middle area of ​​the top surface of the protective structure away from the base is raised; The enclosure bracket is arranged on the surface of the base and on the periphery of the protection structure.

2. A light emitting unit according to claim 1, characterized in that: The top surface of the protection structure is a spherical surface, the distance between the top surface of the enclosure bracket and the base surface is d, and the height difference between the highest point in the middle of the top surface of the protection structure and the top surface of the enclosure bracket is h; wherein, h = (20% to 50%) * d.

3. A light emitting unit according to claim 2, characterized in that: 0.25mm≤h≤0.68mm, the amount of glue required for the protective structure is J, 3.8μg≤J≤6.8μg.

4. A light emitting unit according to claim 3, characterized in that: h=0.40mm,J=4.8μg.

5. A light emitting unit according to claim 2, characterized in that: The value range of h+d is 0.8-1.2 mm.

6. A light emitting unit according to claim 1, characterized in that: The enclosure bracket is made of EMC material, PCT material or ceramic.

7. A light emitting unit according to claim 1, characterized in that: The protective structure is epoxy resin or silica gel, which is mixed with one or more of scattering particles, red phosphor, yellow phosphor, and green phosphor.

8. A light emitting unit according to claim 1, characterized in that: The protective structure is formed integrally on the surface of the light-emitting chip, or is formed by dripping into the enclosure bracket.

9. A vehicle lamp, characterized in that: The light emitting unit comprises the light emitting unit according to any one of claims 1 to 8.

10. A means of transport, characterized in that: The vehicle lamp comprising the vehicle lamp according to claim 9.

Images