LED SMD luminous tube

Abstract

The utility model discloses an LED SMD light-emitting tube, which comprises a light-emitting chip assembly, an inner shell and an outer shell, the outer shell is provided with a groove for accommodating the inner shell, the color of the outer shell is black, the inner shell is provided with a plurality of cavities with upward openings, the cavities are used for accommodating the light-emitting chip assembly, the inner shell and the outer shell are different in color. According to the utility model, the inner shell and the outer shell are designed in a color separation manner, the outer shell is black, light reflection is reduced, the contrast ratio of the display screen is improved, the inner shell is different from the outer shell in color, the light reflection efficiency is improved, the light-emitting brightness of the light-emitting chip is improved, and meanwhile, the nested structure of the inner shell and the outer shell strengthens the overall air tightness and mechanical strength of packaging. In addition, the light-emitting chip assembly can comprise two red chips which are connected in series, the multiple-level brightness of the red chips can be improved after the two red chips are connected in series, and pixel color matching and energy saving are better facilitated.

Description

Technical Field

[0001] This utility model relates to the field of LED light-emitting technology, and in particular to an LED SMD light-emitting tube. Background Technology

[0002] With the rapid development of LED display technology, LED SMD (Surface Mount Device Light-Emitting Diode) has been widely used in indoor and outdoor display screens due to its small size, high-density mounting capability, and excellent display effect. Especially against the backdrop of the increasing demand for small-pitch LED displays, black LED SMD light-emitting diodes have become an important technological direction for improving display quality due to their high contrast and low reflectivity.

[0003] Currently, the industry commonly uses a method of replacing the black injection molding compound in traditional white LED SMD bracket molds to manufacture black LED SMD light-emitting diodes. However, this technology has some drawbacks, such as insufficient brightness. The poor light transmittance of the black compound results in the brightness of black LEDs being only 1 / 2 to 1 / 3 that of white LEDs of the same model. To meet the brightness requirements of outdoor environments, the driving current needs to be increased, which not only increases power consumption but also causes chip overheating, accelerates light decay, and shortens the lifespan of the display screen. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an LED SMD light-emitting tube to solve the problem of poor light transmittance of existing black LED SMD light-emitting tubes.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an LED SMD light-emitting tube, which includes a light-emitting chip assembly, an inner shell and an outer shell. The outer shell has a groove for accommodating the inner shell. The outer shell is black in color. The inner shell has a plurality of upward-facing cavities for accommodating the light-emitting chip assembly. The inner shell and the outer shell are different colors.

[0006] Furthermore, the LED SMD light-emitting diode described in this utility model also includes an electrode support, which includes a first electrode sheet and a plurality of second electrode sheets. The first electrode sheet and the second electrode sheets are at least partially located in the cavity and at least partially extend outward through the inner shell and the outer shell to extend out of the outer shell to form solder feet.

[0007] Furthermore, in the LED SMD light-emitting diode described in this utility model, the first electrode sheet includes a first electrode portion, a second electrode portion, and a third electrode portion. The first electrode portion is stepped, and the second electrode portion and the third electrode portion are respectively disposed on both sides of the first electrode portion, and the second electrode portion and the third electrode portion extend from both ends of the first electrode portion.

[0008] Furthermore, in the LED SMD light-emitting tube described in this utility model, the outer shell is made of black polyphthalamide, and the inner shell is made of white polyphthalamide.

[0009] Furthermore, in the LED SMD light-emitting tube of this utility model, the number of cavities is three, the three cavities are arranged side by side along the first horizontal direction, and the cross-section of the cavity gradually increases upward along the vertical direction.

[0010] Furthermore, in the LED SMD light-emitting tube described in this utility model, the light-emitting chip assembly is an RGB three-color chip, with the three colors of the chip located in the three cavities respectively.

[0011] Furthermore, in the LED SMD light-emitting diode described in this utility model, at least one chip of each color in the RGB three-color chips is fixed on the first electrode plate.

[0012] Furthermore, in the LED SMD light-emitting diode described in this utility model, there are two red chips in the RGB three-color chip, one of which is located on the first electrode plate and the other is located on the second electrode plate, and the two red chips are symmetrically arranged with the horizontal first direction as the axis of symmetry.

[0013] Furthermore, in the LED SMD light-emitting tube of this utility model, the outer shell includes two baffles, which are correspondingly disposed on the partition of the inner shell.

[0014] Furthermore, the LED SMD light-emitting diode described in this utility model also includes a sealing colloid, which covers the light-emitting chip assembly.

[0015] The beneficial effects of this utility model are as follows: This utility model provides an LED SMD light-emitting diode, which divides the LED SMD light-emitting diode's packaging structure into inner and outer shells, and designs the inner and outer shells with different colors (the outer shell is black, and the inner shell is a different color). The black outer shell reduces reflection and improves the contrast of the display screen, while the inner shell is a different color (such as white) to enhance light reflection efficiency and improve the brightness of the light-emitting chip. At the same time, the nested structure of the inner and outer shells strengthens the overall airtightness and mechanical strength of the package. In summary, the LED SMD light-emitting diode provided by this utility model solves the problem of low luminous efficiency caused by the single black material of traditional black LED SMD light-emitting diodes, ultimately enabling the display screen formed based on the LED SMD light-emitting diode to have a high brightness and high contrast display effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the LED SMD light-emitting diode described in this utility model from one perspective in one embodiment.

[0017] Figure 2 This is a schematic diagram of the LED SMD light-emitting diode described in this utility model from another perspective under one embodiment.

[0018] Figure 3 This is an exploded view of the LED SMD light-emitting diode described in this utility model from one perspective in one embodiment.

[0019] Figure 4 This is an exploded view of another structure of the LED SMD light-emitting diode described in this utility model from one perspective under one embodiment.

[0020] Figure 5 for Figure 4 The image shows an exploded view of the LED SMD light-emitting diode from another perspective.

[0021] Figure 6 for Figure 1 The image shows a top view of an LED SMD light-emitting diode.

[0022] Figure 7 for Figure 6 The diagram shows a cross-sectional view of an LED SMD light-emitting diode.

[0023] Figure 8 This is a schematic diagram of the motor bracket in the LED SMD light-emitting diode of the present invention from one perspective in one embodiment.

[0024] Figure 9 This is a schematic diagram of the inner housing of the LED SMD light-emitting diode according to one embodiment, viewed from one perspective.

[0025] Figure 10 This is a circuit diagram of the light-emitting chip in the LED SMD light-emitting diode described in this utility model.

[0026] Label Explanation:

[0027] 1. Light-emitting chip assembly; 11. Red chip; 12. Blue chip; 13. Green chip;

[0028] 2. Electrode support; 21. First electrode plate; 211. First electrode plate portion; 212. Second electrode plate portion; 213. Third electrode plate portion; 22. Second electrode plate; 23. Solder foot;

[0029] 3. Inner shell; 31. Cavity; 32. Partition;

[0030] 4. Outer shell; 41. Groove; 42. Baffle. Detailed Implementation

[0031] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0032] Please refer to Figures 1 to 10 This utility model discloses an LED SMD light-emitting tube, which includes a light-emitting chip assembly 1, an inner shell 3 and an outer shell 4. The outer shell 4 has a groove 41 for accommodating the inner shell 3. The outer shell 4 is black in color. The inner shell 3 has a plurality of upward-facing cavities 31 for accommodating the light-emitting chip assembly 1. The inner shell 3 and the outer shell 4 are different colors.

[0033] As can be seen from the above description, the beneficial effects of this utility model are as follows: This utility model provides an LED SMD light-emitting diode, which divides the LED SMD light-emitting diode packaging structure into inner and outer shells 4, and designs the inner and outer shells 4 with different colors (outer shell 4 is black, inner shell 3 is a different color). The black outer shell 4 reduces reflection and improves the contrast of the display screen, while the inner shell 3 is a different color from the outer shell 4 (such as white) to enhance light reflection efficiency and improve the light output brightness of the light-emitting chip. At the same time, the nested structure of the inner and outer shells 4 strengthens the overall airtightness and mechanical strength of the packaging. In summary, the LED SMD light-emitting diode provided by this utility model solves the problems of low luminous efficiency and poor weather resistance caused by the single black material of traditional black LED SMD light-emitting diodes, ultimately enabling the display screen formed based on the LED SMD light-emitting diode to have a high brightness and high contrast display effect.

[0034] Furthermore, such as Figure 3 as well as Figure 8As shown, the LED SMD light-emitting tube of this utility model also includes an electrode support 2, which includes a first electrode sheet 21 and a plurality of second electrode sheets 213 third electrode portions; 22, the first electrode sheet 21 and the second electrode sheets 213 third electrode portions; 22 are at least partially located in the cavity 31, and at least partially extend outward through the inner shell 3 and the outer shell 4 to extend out of the outer shell 4 to form a solder foot 23.

[0035] As described above, by setting the corresponding electrode support 2, the light-emitting chip assembly 1 can be fixed and conduct electricity. The extended solder feet 23 of the electrode support 2 improve the welding reliability. The exposed solder feet 23 can be directly connected to the external circuit, optimizing the heat dissipation path, reducing the chip operating temperature, and avoiding light decay and failure caused by high temperature.

[0036] Furthermore, such as Figure 3 as well as Figure 8 As shown, in the LED SMD light-emitting diode of this utility model, the first electrode sheet 21 includes a first electrode sheet portion 211, a second electrode sheet portion 212 and a third electrode sheet portion. The first electrode sheet portion 211 is stepped, and the second electrode sheet portion 212 and the third electrode sheet portion are respectively disposed on both sides of the first electrode sheet portion 211, and the second electrode sheet portion 212 and the third electrode sheet portion extend from both ends of the first electrode sheet portion 211.

[0037] As described above, the common electrode sheet (i.e., the first electrode sheet 21) located at the center is diagonally arranged and penetrates the inner and outer cavities 31 of the light-emitting diode, thereby improving the light-emitting diode strength, chip airtightness and chip thermal conductivity.

[0038] Furthermore, in the LED SMD light-emitting tube described in this utility model, the outer shell 4 is made of black polyphthalamide, and the inner shell 3 is made of white polyphthalamide.

[0039] As can be seen from the above description, the outer shell 4 is made of black PPA material, which has both low reflectivity and high weather resistance; the inner shell 3 is made of white PPA material, which has higher reflectivity and further improves light efficiency.

[0040] Furthermore, such as Figure 3 as well as Figure 9 As shown, in the LED SMD light-emitting tube of this utility model, there are three cavities 31, which are arranged side by side along the first horizontal direction, and the cross-section of the cavity 31 gradually increases upward along the vertical direction.

[0041] As described above, the openings of the three parallel cavities 31 gradually increase upwards (larger opening and smaller bottom), using cavity wall reflection to efficiently export the hemispherical light emitted by the light source (such as LED chips), reducing light loss. At the same time, the independent design of the cavity 31 avoids interference from RGB light color mixing, improving color purity.

[0042] Furthermore, such as Figure 1 , Figure 4 as well as Figure 6 As shown, in the LED SMD light-emitting tube of this utility model, the light-emitting chip assembly 1 (i.e. LED chip assembly) is an RGB three-color chip, and the three colors of the chip are respectively located in the three cavities 31.

[0043] As described above, the RGB three-color chips are placed in independent cavities 31 to achieve full-color display. The independent packaging of each color chip allows for targeted optimization of driving parameters (such as connecting the red chip 11 in series to increase brightness), avoiding color deviation caused by current differences and ensuring display uniformity.

[0044] Furthermore, such as Figure 3 as well as Figure 8 As shown, in the LED SMD light-emitting diode of this utility model, at least one chip of each color in the RGB three-color chips is fixed on the first electrode plate 21.

[0045] As described above, the RGB chips are all fixed on a common electrode plate, which simplifies circuit design and reduces wiring complexity. At the same time, the symmetrical layout of the common electrode (such as common anode / common cathode) optimizes current distribution and improves luminous efficiency.

[0046] Furthermore, such as Figure 3 , Figure 6 as well as Figure 8 As shown, in the LED SMD light-emitting diode of this utility model, there are two red chips 11 in the RGB three-color chips. One red chip 11 is located on the first electrode plate 21, and the other red chip 11 is located on the third electrode plate portion 22 of the second electrode plate 213. The two red chips 11 are symmetrically arranged with the horizontal first direction as the axis of symmetry.

[0047] As described above, the red chips 11 are symmetrically arranged on both sides of the electrode sheet. Through a series circuit, they achieve double the brightness output under the same driving current. Connecting two red chips in series can increase the brightness of the red chips by several times, which is more beneficial for pixel color matching and energy saving. Simultaneously, the symmetrical layout balances the heat dissipation path, avoiding localized overheating and extending the lifespan of the red chips 11. In practical applications, one of the external leads of the series-connected red chips 11 is electrically unconnected, mainly to improve the welding strength of the LEDSMD light-emitting diode and facilitate heat dissipation of the red chips 11.

[0048] It should be noted that, as Figure 10 As shown, this utility model also provides a circuit diagram of the light-emitting chip inside the LED SMD light-emitting diode, which is an RGB common anode (positive electrode) circuit. The GB chips are single chips with their anodes connected in parallel, and their respective negative electrodes are lit by their respective driving circuits. The R chips are two chips connected in series and share the same anode with the GB chips; their negative electrodes are driven by the R chips. It should be noted that this can also be transformed into a common cathode circuit structure, or it can be transformed into a configuration where the GB chips share one electrode, and the R chips have two independently connected electrodes.

[0049] Furthermore, such as 1 and Figure 9 As shown, in the LED SMD light-emitting tube of this utility model, the outer shell 4 includes two baffles 42, which are correspondingly disposed on the partition 32 of the inner shell 3.

[0050] As described above, the outer shell 4 baffle 42 covers the inner shell 3 partition 32, further reinforcing the connection stability of the inner and outer shells 4.

[0051] Furthermore, the LED SMD light-emitting tube described in this utility model also includes a sealing colloid, which covers the light-emitting chip assembly 1.

[0052] In practical applications, after the light-emitting chip is fixed and the electrodes are connected, the encapsulating adhesive is applied into three independent elliptical cavities by a dispensing machine to complete the independent airtight adhesive curing of each light-emitting chip. Then, the dispensing machine applies encapsulating adhesive a second time to the upper space of the three cured elliptical cavities. After curing, the upper surface of the first and second encapsulating adhesives can be flat, convex, or concave.

[0053] As described above, the sealing colloid covering the chip forms a double protection (one-time transparent adhesive + two-time translucent black adhesive). The first curing ensures airtightness, the second curing adhesive with a sandblasted surface design reduces surface reflection, and the black translucent adhesive further suppresses stray light and improves contrast.

[0054] Correspondingly, this utility model also provides a method for preparing the above-mentioned LED SMD light-emitting diode, the specific steps of which are as follows:

[0055] (1) The electrode support 2 is made by punching and cutting with a metal stamping die to form a continuous support, and the surface is electroplated; preferably, the electrode support 2 is a thin copper sheet with silver plating.

[0056] (2) Set up an injection mold for the inner shell 3, and use an injection molding machine to perform one injection molding of the inner shell 3 on the continuous electrode bracket 2; preferably, the inner shell 3 mold is a precision plastic mold, and the plastic material is white PPA.

[0057] (3) The electrode bracket 2 that has been injection molded is cut and bent for the first time, so that the bent electrode leads 23 are bent at a certain angle and exposed on the outer side of the inner shell 3; preferably, the electrode bracket 2 is cut and bent using a precision metal punching and bending die.

[0058] (4) Set up an injection mold for the outer shell 4, and perform secondary injection molding to form the pre-formed continuous inner shell 3 and electrode support 2; preferably, the outer shell 4 mold is a precision plastic mold, and the outer shell 4 is made of black PPA.

[0059] (5) Apply glue to the light-emitting chip that has been fixed on the electrode support 2 in the cavity. After the first glue has cured, apply a second glue in the space above the first glue and cure it at high temperature. Preferably, the first glue is a transparent epoxy resin glue; the second glue is an epoxy resin glue with a certain light transmittance mixed with black material; the upper surface of the cured second glue is sanded and the surface is convex.

[0060] (6) The electrode brackets 2 with cured adhesive are punched and bent a second time, and then cut and separated into individual light-emitting tubes. These tubes are then packaged by a sorting and tape-making equipment for subsequent SMT assembly applications. Preferably, the electrode brackets 2 are cut and bent using a precision metal punching and bending die for the second punching and bending, and sorting and packaging are completed by general-purpose equipment.

[0061] Please refer to Figures 1 to 9 The preferred embodiment of this utility model is: an LED SMD light-emitting diode, which includes an electrode support 2 for fixing the LED chip, inner and outer light-emitting shells, the LED chip, and encapsulating adhesive, as described below. Figures 1 to 9 Detailed introduction.

[0062] In this embodiment, as Figure 3 as well as Figure 8 As shown, the electrode support 2 includes an electrode sheet for fixing the LED chip and electrode solder pads 23. The electrode support 2 is used to fix one or more RGB chips and serves as an external lead for one electrode of the RGB chip. In this embodiment, the common electrode sheet at the center is arranged diagonally, penetrating the inner shell 3 and outer shell 4 of the light-emitting diode, thereby improving the strength of the light-emitting diode, the chip's airtightness, and its thermal conductivity.

[0063] In this embodiment, when two red chips 11 (i.e., R chips) are connected in series, their brightness can be doubled under the same driving current. In the series-connected R chips, the external lead of one of the electrode plates is electrically unused, mainly to improve the soldering strength of the LED SMD light-emitting diode, and also to facilitate heat dissipation of the R chip. For the RGB tri-color chips, at least one of each color's light-emitting chip is disposed on a common electrode plate, which can be configured using a common anode or common cathode circuit. The G chip is located close to the solder lead 23 of the external lead electrode plate for heat dissipation; the common electrode plate has a zigzag shape, with solder leads 23 diagonally from the middle of the electrode plate.

[0064] In this embodiment, as Figure 3 , Figure 4 as well as Figure 6 As shown, the inner shell 3 and the electrode support 2 together constitute the mounting and light-emitting space of the LED chip. During the manufacturing process, the plastic of the inner shell 3 can fix multiple metal electrode pieces (i.e., the first electrode piece 21 and multiple second electrode pieces 22) in the punched-open electrode support 2 into a single RGB insulating electrode piece. Figure 9 As shown, the inner housing 3 has three cavities 31, which are sequentially designated as a first cavity, a second cavity, and a third cavity along a horizontal first direction. Each of the three cavities 31 is used to hold a chip of any one color from the RGB three-color chips. For example, the cavities 31 at the two ends are the first and third cavities. The first cavity holds two R chips (i.e., red chip 11), which are electrically connected in series and symmetrically distributed on both sides of the center line of the support electrode, arranged at equal intervals. The third cavity holds a G chip (i.e., green chip 13). The middle cavity 31 is the second cavity, which holds a B chip (i.e., blue chip 12). Of course, in some other optional embodiments, the holding positions of the G chip and the B chip can be interchanged, and this is not limited here. Furthermore, it should be noted that the above-mentioned cavities 31 have a structure with a larger opening and a smaller bottom, and the bottom surface of the cavity 31 is on the same plane as the support electrode sheet. In practical applications, the light emitted by the RGB chip in a hemispherical shape is reflected by the electrode support 2 and then reflected out through the adhesive wall of the cavity 31 with a certain cavity wall height, thus achieving efficient acquisition of the light emitted by the chip.

[0065] In this embodiment, as Figure 7As shown, the outer shell 4 is secured to the electrode support 2 and covers the outside of the inner shell 3. During the manufacturing process, it encapsulates the electrode support 2 and the inner shell 3 into a single unit, further strengthening the structural strength of the electrode support 2, the inner shell 3, and the outer shell 4, as well as the airtightness of the electrode lead-out solder joints 23. The outer shell 4 is formed by secondary injection molding on the inner shell 3 and the electrode support 2, with the plastics of the inner and outer shells 4 using different colored materials. In addition, the outer shell 4 also includes two baffles 42, which are positioned vertically below the height of the surrounding outer shell 4 walls. The two baffles 42 are located above the junctions (i.e., partitions 32) of the three cavities 31 of the inner shell 3, and on the upper surface of the partitions 32, with the slope of the two baffles 42 in the vertical direction matching the slope of the cavity walls of the cavity 31. In the front projection area of ​​the LED SMD light-emitting diode, except for the chip electrode area, the inner shell 3 is completely covered by the projection of the outer shell 4.

[0066] In this embodiment, during the fabrication process, after the RGB three-color chips are fixed and the electrode connections are completed, the encapsulating adhesive is applied into the three independent cavities 31 by a dispensing machine, completing the independent airtight adhesive curing of each chip. Then, the dispensing machine performs a second dispensing on the upper space of the cured cavity 31. The upper surfaces of the cured primary and secondary encapsulating adhesives can be flat, convex, or concave.

[0067] In summary, the LED SMD light-emitting tube provided by this utility model has the following characteristics: by reconstructing the light-emitting chip, the inner and outer light-emitting cavities 31 have the functions of light emission and structural reinforcement, and the light-emitting chip and chip electrode are reasonably configured to maximize the light energy collection and emission of the light emitted by the light-emitting chip, resulting in high light efficiency; the light-emitting tube appears black and non-reflective, and the airtightness and physical structural strength of the light-emitting tube are reinforced by the inner and outer shells 4, so as to achieve a black and bright display screen with high reliability.

[0068] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An LED SMD light-emitting diode, characterized in that, The device includes a light-emitting chip assembly, an inner housing, and an outer housing. The outer housing has a groove for accommodating the inner housing. The outer housing is black, and the inner housing is white. The inner housing has multiple upward-facing cavities for accommodating the light-emitting chip assembly.

2. The LED SMD light-emitting diode according to claim 1, characterized in that, It also includes an electrode support, which includes a first electrode sheet and a plurality of second electrode sheets. The first electrode sheet and the second electrode sheets are at least partially located in the cavity and at least partially extend outward through the inner shell and the outer shell to extend out of the outer shell to form a weld foot.

3. The LED SMD light-emitting diode according to claim 2, characterized in that, The first electrode plate includes a first electrode plate portion, a second electrode plate portion, and a third electrode plate portion. The first electrode plate portion is stepped, and the second electrode plate portion and the third electrode plate portion are respectively disposed on both sides of the first electrode plate portion, and the second electrode plate portion and the third electrode plate portion extend from both ends of the first electrode plate portion.

4. The LED SMD light-emitting diode according to claim 1, characterized in that, The outer shell is made of black polyphthalamide, and the inner shell is also made of polyphthalamide.

5. The LED SMD light-emitting diode according to claim 2, characterized in that, The number of cavities is three, and the three cavities are arranged side by side along the first horizontal direction, and the cross-section of the cavities gradually increases upward along the vertical direction.

6. The LED SMD light-emitting diode according to claim 5, characterized in that, The light-emitting chip assembly is an RGB three-color chip, with the three colors of the chip located in the three cavities respectively.

7. The LED SMD light-emitting diode according to claim 6, characterized in that, In the RGB three-color chip, at least one chip of each color is fixed on the first electrode plate.

8. The LED SMD light-emitting diode according to claim 6, characterized in that, The RGB three-color chip has two red chips, one of which is located on the first electrode plate and the other is located on the second electrode plate. The two red chips are symmetrically arranged with the horizontal first direction as the axis of symmetry.

9. The LED SMD light-emitting diode according to claim 1, characterized in that, The outer shell includes two baffles, which are correspondingly disposed on the partition of the inner shell.

10. The LED SMD light-emitting diode according to claim 1, characterized in that, It also includes a sealing colloid that covers the light-emitting chip assembly.

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