TOP LED lamp bead for outdoor display screen and preparation method of TOP LED lamp bead

Abstract

The invention discloses a TOP LED lamp bead for an outdoor display screen and a preparation method of the TOP LED lamp bead, and relates to the technical field of LED devices. The TOP LED lamp bead comprises a plastic support, wherein a bowl cup is formed at the top of the plastic support; the metal cup is embedded into the plastic bracket towards one side deviating from the bowl cup, and an opening of the metal cup faces one side of the bowl cup; the at least two pins are at least partially embedded in the plastic support and are bent to form an upper pin and a lower pin which are electrically connected, and the pins and the metal cup are arranged in an insulating manner; the at least one LED chip is arranged on the bottom surface of the metal cup; the lower pin is electrically connected with the upper pin; and the packaging colloid is arranged in the bowl cup and covers the metal cup and the LED chip. According to the invention, the brightness and reliability of the lamp bead can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of LED devices, and in particular to a TOP LED lamp bead for an outdoor display screen and a preparation method thereof. Background Art

[0002] The application scenarios of LED outdoor display screens are very wide, including but not limited to advertising, festivals, sports events, traffic signs, urban construction, commercial displays, etc. LED outdoor display screens generally use TOP LED lamp beads. The currently commonly used TOP LED lamp beads are packaged with 7mil×7mil red light + 7mil×9mil blue light, green light LED chips with ordinary stretch brackets and epoxy resin encapsulation glue. The brightness of this type of lamp bead is 6000~7000nit after the chip is mounted into a whole screen in the later stage. In some scenarios where high-brightness products are required, it is necessary to choose outdoor lamp beads with higher brightness, but because the main way to increase the brightness is to increase the chip size to increase the brightness, not only the cost is more than 50% higher than that of conventional lamp beads, but also because of the bracket space factor, the chip size cannot be further increased after it is increased to a certain extent; this invention provides a new solution. Through the change of the bracket structure and process, the brightness of the product can be maximized without increasing the chip size to increase the brightness and increasing excessive costs.

[0003] On the other hand, outdoor display screens are mostly used in harsh environments, which have high requirements for the moisture resistance of the display screen. However, the existing TOP LED lamp beads have poor air tightness, poor moisture resistance and low reliability. Figure 1 , the TOP LED lamp beads in the prior art include a plastic support 1a, at least two pins 3a, an LED chip 4a and a packaging colloid 5a, wherein the plastic support 1a forms a bowl, the pins 3a extend into the bowl, and at least one LED chip 4a is fixed on the pins 3a extending into the bowl. When in use, moisture easily enters the bowl along the gap between the pins 3a and the plastic support 1a, corroding the electrodes of the LED chip 4a, resulting in poor reliability. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a TOPLED lamp bead for outdoor display screens and a preparation method thereof, which has high brightness and strong reliability.

[0005] In order to solve the above technical problems, the present invention provides a TOP LED lamp bead for an outdoor display screen, which comprises: A plastic stand with a top forming a bowl; A metal cup, which is embedded in the plastic bracket toward a side facing away from the bowl and has an opening toward the side of the bowl; At least two pins, which are at least partially embedded in the plastic bracket and are bent to form an upper pin and a lower pin that are electrically connected, and the pins are insulated from the metal cup; At least one LED chip is disposed on the bottom surface of the metal cup and is electrically connected to the upper pin; and The packaging colloid is arranged in the bowl and covers the metal cup and the LED chip.

[0006] As an improvement of the above technical solution, the side wall of the metal cup is inclined, and the inclination angle is 60°~85°.

[0007] As an improvement of the above technical solution, an Ag reflective layer is provided on the side wall of the metal cup.

[0008] As an improvement of the above technical solution, a gap is provided between the top of the metal cup and the upper pin, and the gap is filled with support glue to insulate the metal cup from the upper pin.

[0009] As an improvement of the above technical solution, the plastic bracket includes an inner bracket and an outer bracket, the outer bracket at least partially wraps the inner bracket, and the top of the outer bracket is higher than the top surface of the inner bracket to form the bowl cup; The pin further includes a bending portion disposed between the upper pin and the lower pin, the bending portion is disposed on the outer side of the inner bracket, and the bending portion is at least partially wrapped by the outer bracket.

[0010] As an improvement of the above technical solution, the bending portion includes an upper bending portion and a lower bending portion bent along a first direction, and a transition portion bent toward a second direction, wherein the transition portion connects the upper bending portion and the lower bending portion; the first direction intersects with the second direction; The upper bending portion and the transition portion are arranged between the inner bracket and the outer bracket, and the lower bending portion is arranged on the outer side of the inner bracket.

[0011] As an improvement of the above technical solution, the LED chips include a red LED chip, a blue LED chip and a green LED chip, all of which are fixed on the bottom surface of the metal cup; The TOP LED lamp bead includes a plurality of pins, which are respectively used to be electrically connected to the red LED chip, the blue LED chip and the green LED chip.

[0012] As an improvement of the above technical solution, it also includes a lens colloid, which is arranged on the packaging colloid; The top of the encapsulating colloid is spherical or ellipsoidal.

[0013] Correspondingly, the present invention also discloses a method for preparing a TOP LED lamp bead for an outdoor display screen, which is used to prepare the above-mentioned TOP LED lamp bead, and comprises: (1) stamping and stretching the bracket material to form an intermediate metal bracket, wherein the intermediate metal bracket includes a downwardly recessed metal cup, a pin portion for forming a metal pin, and a connecting portion for connecting the metal cup and the pin portion; (2) forming a plastic bracket by injection molding, so that the metal cup and at least a portion of the pin portion are embedded in the plastic bracket; (3) bending the pin portion exposed outside the plastic bracket; (4) Fixing the LED chip to the bottom surface of the metal cup and forming an electrical connection with the pin; (5) Encapsulating with encapsulating glue to form an encapsulating colloid; (6) The connecting portion is removed to separate the TOP LED lamp beads for outdoor display screens.

[0014] As an improvement of the above technical solution, step (1) includes: (1.1) Punching and stretching the bracket material to form an intermediate metal bracket; (1.2) A Ag reflective layer is formed on the intermediate metal support.

[0015] The implementation of the present invention has the following beneficial effects: In the TOP LED lamp bead for outdoor display screens in one embodiment of the present invention, a metal cup that is recessed downward and embedded in a plastic bracket is introduced, and the LED chip is fixed to the bottom surface of the metal cup. Based on this structure, the side wall of the metal cup can realize concentrated reflection of the light emitted by the LED chip, thereby improving the brightness of the TOP LED lamp bead. In addition, the metal cup in this embodiment is insulated from the pin, that is, the metal cup is not in direct contact with the pin, which changes the flow path of water vapor in the TOP LED lamp bead, changes the penetration pressure of moisture, makes it more difficult for moisture to spread to the metal cup, thereby avoiding moisture spreading to the LED chip, causing chip failure, and effectively improving the reliability of the TOP LED lamp bead. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of TOP LED lamp beads in the prior art; Figure 2 1 is a schematic diagram of the cross-sectional structure of a TOP LED lamp bead used for a display screen in one embodiment of the present invention; Figure 3 It is a schematic diagram of the front structure of a TOP LED lamp bead used for a display screen in one embodiment of the present invention; Figure 4It is a schematic diagram of the back structure of a TOP LED lamp bead used for a display screen in one embodiment of the present invention; Figure 5 is a front structural schematic diagram of an intermediate metal bracket in one embodiment of the present invention; Figure 6 1 is a schematic diagram of the front structure of the intermediate metal bracket after step (3) in one embodiment of the present invention. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0018] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top” and “bottom” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] See also Figure 2~Figure 4 This embodiment provides a TOP LED lamp bead for an outdoor display screen, which includes a plastic bracket 1, a metal cup 2, at least two pins 3, at least one LED chip 4 and a packaging colloid 5.

[0021] Among them, the plastic bracket 1 can be formed by injection molding of a bracket glue commonly used in the art. Specifically, the bracket glue can be PPA, PA6T, PA9T or epoxy resin, but is not limited thereto. Preferably, the bracket glue is PPA, which has high strength, good rigidity and excellent fatigue resistance. Specifically, the top of the plastic bracket 1 forms a bowl 11, the interior of which is used to fix the LED chip 4 and form a packaging colloid 5. Correspondingly, the metal cup 2 is also fixed in the opening area of ​​the bowl 11.

[0022] Among them, the metal cup 2 is embedded in the plastic bracket 1 toward the side away from the bowl cup 11, and its opening faces the side of the bowl cup 11, and the LED chip 4 is fixed on the bottom surface 22 of the metal cup. Since the side wall 21 of the metal cup made of metal material has a high reflectivity, the light emitted by the LED chip 4 is concentratedly reflected, thereby improving the brightness of the TOP LED lamp bead. In addition, the provision of the metal cup 2 also means that the metal area in direct contact with the LED chip 4 is increased, the heat dissipation capacity is enhanced, and problems such as lamp bead failure caused by thermal stress concentration are avoided, thereby improving the reliability of the TOP LED lamp bead. Specifically, the material of the metal cup 2 may be copper, iron or nickel, but is not limited thereto. Copper is preferred, which not only has a high reflectivity and low cost, but also has good ductility and is easy to process.

[0023] Among them, the pin 3 is at least partially embedded in the plastic bracket 1, and is bent to form an upper pin 31 and a lower pin 32 that are electrically connected. The upper pin 31 is arranged on the side of the plastic bracket 1 where the bowl 11 is located, and the lower pin 32 is arranged on the side of the plastic bracket 1 away from the bowl 11. The electrode of the LED chip 4 is electrically connected to the upper pin 31, and the lower pin 32 is used to connect with a circuit board (such as a PCB board, etc.) later, so as to drive the LED chip 4. Specifically, the pin 3 is made of the same material as the metal cup 2, which can be copper, iron or nickel, but is not limited thereto. Copper is preferred.

[0024] Specifically, the pin 3 and the metal cup 2 are insulated, that is, a packaging colloid is arranged between the two, and the two are not in direct contact. This makes it impossible for water vapor to flow directly to the metal cup 2 where the LED chip is located through the pin 3 after entering the TOP LED lamp bead through the gap between the pin 3 and the plastic bracket 1, so that the flow path of the water vapor is changed, and the penetration pressure of the water vapor is changed, making it more difficult for the water vapor to spread to the metal cup 2, and then spread to the LED chip 4, causing the LED chip 4 to fail, effectively improving the reliability of the TOPLED lamp bead. It should be noted that the metal part of the packaging bracket of the traditional TOP LED lamp bead is generally patterned by stamping and cutting. The cross-section formed by this cutting is often easy to form a gap with the plastic bracket and the packaging colloid, and water vapor can easily invade along the gap. The traditional pin and the solid crystal area are an integrated structure, which makes it easy for water vapor to invade the solid crystal area where the LED chip is located, and then corrode the electrodes of the LED chip, causing defects such as dead lights, and reducing reliability. In the present embodiment, the pin 3 is not in direct contact with the metal cup 2 for fixing the LED chip 4. That is to say, after water vapor enters the interior of the lamp bead along the gap between the pin 3 and the packaging colloid 5 / plastic bracket 1, the interface structure of the transmission channel will change, for example, from the Cu-PPA interface to the epoxy resin-PPA interface, which changes the penetration pressure of water vapor, effectively preventing water vapor from entering the metal cup 2, thereby improving the reliability of the lamp bead.

[0025] The LED chip 4 may be a common upright LED chip or a vertical LED chip in the art, but is not limited thereto. In terms of the emission wavelength, it may be a red LED chip, a blue LED chip, a green LED chip, or a purple LED chip, but is not limited thereto.

[0026] The encapsulating colloid 5 is disposed in the bowl 11, and covers the metal cup 2 and the LED chip 4. The encapsulating colloid 5 can be obtained by curing silica gel or epoxy resin, but is not limited thereto. Preferably, it is obtained by curing epoxy resin.

[0027] Preferably, in some embodiments of the present invention, the side wall 21 of the metal cup is inclined, and its inclination angle is 60°~85°, wherein the inclination angle refers to the angle between the side wall 21 of the metal cup and the bottom surface 22 of the metal cup. Exemplarily, the inclination angle is 62°, 67°, 72° or 80°, but not limited thereto. By controlling the inclination angle, not only the brightness can be further improved, but also the light type can be adjusted, the luminous angle can be increased, and the display effect can be improved. It should be noted that in traditional TOP LED lamp beads, in order to increase the light intensity, a spherical lens is often formed above the encapsulation colloid, which can effectively increase the brightness, but it will also greatly reduce the luminous angle. For example, when the spherical lens is not set, the luminous angle is about 105~115°, and after setting, it will drop sharply to 70~80°. This also means that when forming a display screen, the spacing needs to be enlarged, which increases the volume of the display screen assembly. In this embodiment, by setting a metal cup and controlling the angle of its side wall, the brightness can be improved while the luminous angle is not reduced. Specifically, by adopting the technical solution of this embodiment, under the condition that other conditions are the same, even when a spherical lens colloid 6 is provided on the packaging colloid 5, the light-emitting angle can still reach 105°-112°, which hardly affects the light-emitting angle.

[0028] Preferably, in some embodiments of the present invention, in order to further improve the reflectivity of the side wall 21 of the metal cup, a reflective layer with high reflectivity can be formed on the side wall 21 of the metal cup, such as an Ag reflective layer, an Al reflective layer, etc., but not limited thereto. More preferably, an Ag reflective layer is formed on the side wall 21 of the metal cup, which can not only optimize the reflectivity, but also further improve the thermal conductivity of the metal cup 2, so that the heat generated by the LED chip 4 can be quickly distributed to various parts of the metal cup 2, and then conducted to the packaging colloid 5 and the plastic bracket 1, reducing thermal stress concentration and further improving the reliability of the TOP LED lamp bead. More preferably, a nickel layer and an Ag reflective layer are provided on the side wall 21 of the metal cup and the bottom surface 22 of the metal cup in sequence, which can not only improve the reflectivity of light and improve the brightness, but also optimize the connection of the bonding wire 7.

[0029] Preferably, in one embodiment of the present invention, a gap 14 is provided between the top of the metal cup 2 and the upper pin 31, and the gap 14 is filled with a support glue to insulate the metal cup 2 from the upper pin 31. The structure is simple to form and can effectively achieve insulation between the metal cup 2 and the upper pin 31. It can also enhance the barrier effect against water vapor and further improve the reliability of the TOP LED lamp bead.

[0030] Preferably, in some embodiments of the present invention, the plastic bracket 1 includes an inner bracket 12 and an outer bracket 13, the outer bracket 13 at least partially wraps the inner bracket 12, and the top of the outer bracket 13 is higher than the top surface of the inner bracket 12 to form a bowl 11; the pin 3 also includes a bending portion 33 arranged between the upper pin 31 and the lower pin 32, the bending portion 33 is arranged on the outside of the inner bracket 12, and the bending portion 33 is at least partially wrapped by the outer bracket 13, which makes the area of ​​the pin 3 covered by the bracket glue more, further improves the airtightness, and improves the reliability of the TOP LED lamp bead.

[0031] More preferably, the bending portion 33 includes an upper bending portion 331 and a lower bending portion 333 bent along a first direction, and a transition portion 332 bent toward a second direction, wherein the transition portion 332 connects the upper bending portion 331 and the lower bending portion 333; the upper bending portion 331 and the transition portion 332 are disposed between the inner bracket 12 and the outer bracket 13, and the lower bending portion 333 is disposed on the outer side of the inner bracket 12. Based on this structure, after water vapor enters the lamp bead through the gap between the transition portion 332 and the inner bracket 12 / outer bracket 13, it needs to change direction multiple times, the flow channel is extended, the intrusion of water vapor is reduced, and the reliability of the TOP LED lamp bead is improved. The first direction and the second direction intersect, specifically, the first direction may be a vertical direction or a substantially vertical direction, and the second direction may be a horizontal direction or a substantially horizontal direction, but is not limited thereto.

[0032] Specifically, in some embodiments of the present invention, the LED chip 4 includes at least one of a first LED chip, a second LED chip, and a third LED chip. The first LED chip, the second LED chip, and the third LED chip emit at least one of red light, green light, and blue light, respectively. In other embodiments, the LED chip 4 can be a single color, a dual color, or a combination of three colors of red light, green light, and blue light LED chips, which is designed according to the functional requirements of the actual product and is not limited here. Through the above-mentioned LED chip 4, various types of display screens can be formed, such as full color, dual color, monochrome, etc.

[0033] Preferably, in one embodiment of the present invention, the LED chip 4 includes a red LED chip 41, a blue LED chip 43 and a green LED chip 42, all of which are fixed on the bottom surface 22 of the metal cup. The TOP LED lamp bead includes a plurality of pins, which are respectively used to electrically connect to the red LED chip 41, the blue LED chip 43 and the green LED chip 42. Specifically, the electrode of the LED chip 4 can be electrically connected to the pin 3 through a bonding wire 7, but is not limited thereto. Among them, the bonding wire 7 can be a gold wire or a silver wire, but is not limited thereto.

[0034] Specifically, in some embodiments of the present invention, the TOP LED lamp bead further includes a lens colloid 6, which is disposed on the encapsulation colloid 5. Specifically, the lens colloid 6 and the encapsulation colloid 5 can be an integrated structure or a split structure. Preferably, in one embodiment, the lens colloid 6 is a split structure formed on the surface of the encapsulation colloid 5 by molding. The top of the lens colloid 6 is spherical or ellipsoidal, which can further improve the brightness.

[0035] Correspondingly, an embodiment of the present invention further discloses a method for preparing a TOP LED lamp bead for an outdoor display screen, which is used to prepare the above-mentioned TOP LED lamp bead, and comprises the following steps: (1) Punching and stretching the bracket material to form an intermediate metal bracket 100; The support material may be copper foil, but is not limited thereto.

[0036] Specifically, after a common stamping process and a stretching process in the art, the unnecessary parts of the bracket material can be removed to form the intermediate metal bracket 100. Figure 5 The middle metal bracket 100 includes a metal cup 2 that is concave downward, a pin portion 110 for forming a pin 3, and a connecting portion 120 for connecting the metal cup 2 and the pin portion 110. A preset distance is set between the metal cup 2 and the pin portion 110 to achieve insulation between the two. At the same time, the connecting portion 120 also surrounds the pin portion 110 and the metal cup 2 as a whole, so as to form multiple plastic brackets 1 in sequence through the injection process, simplifying the process.

[0037] Preferably, in one embodiment, step (1) comprises: (1.1) Punching and stretching the bracket material to form an intermediate metal bracket; (1.2) A Ag reflective layer is formed on the intermediate metal support.

[0038] More preferably, in one embodiment, a nickel layer is first formed on the intermediate metal support, and then an Ag reflective layer is formed.

[0039] (2) forming the plastic bracket 1 by injection molding, so that the metal cup 2 and at least a portion of the pin portion 110 are embedded in the plastic bracket 1; (3) Bend the pins exposed outside the plastic bracket; Specifically, the pin portion 110 and the connecting portion 120 may be disconnected by a stamping process (see Figure 6 ), and then bend the pin portion 110 along the plastic bracket 1.

[0040] (4) Fix the LED chip to the bottom surface of the metal cup and form an electrical connection with the pins; (5) Encapsulating with encapsulating glue to form an encapsulating colloid; Preferably, in one embodiment, this step further includes the step of forming a lens colloid 6 on the packaging colloid 5 .

[0041] (6) The connecting portion 120 is removed and the TOP LED lamp beads for outdoor display screens are separated.

[0042] The TOP LED lamp beads obtained based on the above embodiment of the present invention are tested with the traditional TOP LED lamp beads, as shown in Table 1: Table 1 Brightness comparison between this technical solution and the prior art

[0043] It can be clearly seen from the table that based on the TOP LED lamp bead structure in the embodiment of the present invention, the luminous brightness of each LED chip is significantly improved.

[0044] In addition, the TOP LED lamp beads obtained by the present invention and Figure 1 The TOP LED lamp beads in the prior art were soaked in water for 24 hours and weighed before and after soaking. The results showed that the weight gain of the LED lamp beads in this technical solution was 0.09%~0.19%, while the weight gain of the prior art was 0.25%~0.33%. This shows that the TOP LED lamp beads in this technical solution have higher air tightness.

[0045] In addition, the TOP LED lamp beads obtained by the present invention are Figure 1 The TOP LED lamp beads in the prior art solution shown in FIG. Figure 1 The TOP LED lamp beads with a spherical convex mirror were tested for luminous angles. The specific results are shown in Table 2: Table 2 Comparison of luminous angles between this technical solution and the prior art

[0046] It can be clearly seen from the table that based on the TOP LED lamp bead structure in the embodiment of the present invention, its light-emitting angle is relatively large, which is basically consistent with the light-emitting angle of the TOP LED lamp bead without a convex mirror in the prior art.

[0047] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A TOP LED lamp bead for outdoor display screen, characterized in that: include: A plastic stand with a top forming a bowl; A metal cup, which is embedded in the plastic bracket toward a side facing away from the bowl and has an opening toward the side of the bowl; At least two pins, which are at least partially embedded in the plastic bracket and are bent to form an upper pin and a lower pin that are electrically connected, and the pins are insulated from the metal cup; At least one LED chip is disposed on the bottom surface of the metal cup and is electrically connected to the upper pin; and The packaging colloid is arranged in the bowl and covers the metal cup and the LED chip.

2. The TOP LED lamp bead for outdoor display screen according to claim 1, characterized in that: The side wall of the metal cup is inclined, and the inclination angle is 60° to 85°.

3. The TOP LED lamp bead for outdoor display screen according to claim 1 or 2, characterized in that: An Ag reflective layer is arranged on the side wall of the metal cup.

4. The TOP LED lamp bead for outdoor display screen according to claim 1, characterized in that: A gap is provided between the top of the metal cup and the upper pin, and the gap is filled with support glue to insulate the metal cup from the upper pin.

5. The TOP LED lamp bead for outdoor display screen according to claim 1, characterized in that: The plastic support comprises an inner support and an outer support, wherein the outer support at least partially wraps the inner support, and the top of the outer support is higher than the top surface of the inner support, so as to form the bowl cup; The pin further includes a bending portion disposed between the upper pin and the lower pin, the bending portion is disposed on the outer side of the inner bracket, and the bending portion is at least partially wrapped by the outer bracket.

6. The TOP LED lamp bead for outdoor display screen according to claim 5, characterized in that: The bending portion includes an upper bending portion and a lower bending portion bent along a first direction, and a transition portion bent toward a second direction, wherein the transition portion connects the upper bending portion and the lower bending portion; the first direction intersects with the second direction; The upper bending portion and the transition portion are arranged between the inner bracket and the outer bracket, and the lower bending portion is arranged on the outer side of the inner bracket.

7. The TOP LED lamp bead for outdoor display screen according to claim 1, characterized in that: The LED chips include a red LED chip, a blue LED chip and a green LED chip, all of which are fixed on the bottom surface of the metal cup; The TOP LED lamp bead includes a plurality of pins, which are respectively used to be electrically connected to the red LED chip, the blue LED chip and the green LED chip.

8. The TOP LED lamp bead for outdoor display screen according to claim 1, characterized in that: Also included is a lens colloid, which is disposed on the packaging colloid; The top of the encapsulating colloid is spherical or ellipsoidal.

9. A method for preparing a TOP LED lamp bead for an outdoor display screen, for preparing the TOP LED lamp bead for an outdoor display screen as claimed in any one of claims 1 to 8, characterized in that: include: (1) stamping and stretching the bracket material to form an intermediate metal bracket, wherein the intermediate metal bracket includes a downwardly recessed metal cup, a pin portion for forming a metal pin, and a connecting portion for connecting the metal cup and the pin portion; (2) forming a plastic bracket by injection molding, so that the metal cup and at least part of the pin portion are embedded in the plastic bracket; (3) bending the pin portion exposed outside the plastic bracket; (4) Fixing the LED chip to the bottom surface of the metal cup and forming an electrical connection with the pin; (5) Encapsulating with encapsulating glue to form an encapsulating colloid; (6) The connecting portion is removed to separate the TOP LED lamp beads for outdoor display screens.

10. The method for preparing TOP LED lamp beads for outdoor display screens according to claim 9, characterized in that: Step (1) includes: (1.1) Punching and stretching the bracket material to form an intermediate metal bracket; (1.2) A Ag reflective layer is formed on the intermediate metal support.

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