A small-pitch LED lamp bead and a preparation method thereof

Abstract

This invention relates to the fields of maternal and infant products and smart wearable devices, and discloses a small-pitch LED bead, including a blue LED chip and a reflective substrate sequentially packaged on the front side of a base. The front side of the base is provided with a transparent cover plate, and pins are provided on the base. A SiO2 diffusing agent is added to the transparent cover plate to control the light emission angle of the blue LED chip to be not less than 150°. The size range of the blue LED chip is 8*10mil to 10*12mil. Furthermore, a method for preparing the small-pitch LED bead is disclosed, thereby providing a small-pitch LED bead with a small bending radius that can be used in close-fitting wearable devices and a large light emission angle.

Description

Technical Field

[0001] This invention relates to the technical field of maternal and infant products and smart wearable devices, and in particular to a small-pitch LED bead for fading mild to moderate jaundice in newborns and its preparation method. Background Technology

[0002] Neonatal jaundice is the most common symptom in newborns, referring to the yellowing of the skin, mucous membranes, and sclera caused by elevated bilirubin levels in the blood due to abnormal bilirubin metabolism. It is seen in more than 50% of full-term infants and more than 80% of premature infants in the Asian population. Treatment methods for neonatal jaundice include drug therapy, exchange transfusion, phototherapy, hyperbaric oxygen therapy, gene therapy, and enzyme therapy. Among these, phototherapy is currently the recommended method for treating jaundice in clinical practice due to its good efficacy and mild side effects.

[0003] Currently, phototherapy equipment for neonatal jaundice in China mainly includes blue light lamps, blue light boxes, and blue light beds. While 3D blue light lamps and blue light boxes have good therapeutic effects, they also have certain side effects on infants, such as fever, irritability, vomiting, diarrhea, and rashes. Caregivers may experience blurred vision and nausea when observing and caring for infants under blue light lamps or in blue light boxes, hindering normal nursing care. They are also unsuitable for rooming-in, affecting breastfeeding. Blue light beds make it difficult to change the infant's position during treatment, making feeding difficult and increasing the risk of spitting up. Furthermore, most parents are unwilling to allow their infants to be treated in a prone position, further affecting the therapeutic effect of this equipment.

[0004] To address the aforementioned issues, the prior art discloses a Chinese patent document with authorization announcement number CN 208990075 U entitled "A Blue Light Therapy Blanket for Treating Neonatal Jaundice".

[0005] One type of blue light therapy blanket used to treat neonatal jaundice uses 3014 LED beads as its light source, with dimensions of 3*1.4*0.8mm. While this type of bead can achieve good light intensity, a large bead package size increases its bending radius, potentially causing damage to the bead and FPC backplate during the fabrication of wearable devices due to insufficient bending performance. Simply reducing the bead package size results in a small irradiation area and insufficient light intensity (referencing the standard phototherapy level of 6μW / nm·cm). 2 ~12μW / nm·cm 2 However, existing technologies cannot effectively reduce jaundice in newborns. Therefore, the technical problem that needs to be solved is to meet the technical requirements of wearable devices while also effectively reducing jaundice in newborns. Summary of the Invention

[0006] This invention mainly addresses the technical problems existing in the prior art, and provides a small-pitch LED light bead with a small bending radius that can be used as a wearable device for close-fitting clothing, and a large light-emitting angle that can effectively reduce yellowing in newborns.

[0007] To address the aforementioned technical problems and achieve the aforementioned objectives, this invention provides a small-pitch LED chip, comprising a blue LED chip and a reflective substrate sequentially encapsulated on the front side of a base. The front side of the base has a transparent cover plate, and pins are disposed on the base. The key feature is the addition of a SiO2 diffusing agent to the transparent cover plate to control the emission angle of the blue LED chip to be no less than 150°. Given that the principle analysis, materials, structure, and manufacturing method of the blue LED chip are identical, the larger the chip size, the greater its luminous power. When the size is less than 8*10 mil, the blue LED chip cannot generate a light power greater than 0.45mW (operating current 1.0mA) under current industrial manufacturing capabilities. When the size is greater than 10*12 mil, it affects processes such as die bonding, wire bonding, and cutting during encapsulation, thereby reducing production efficiency and light extraction efficiency. Therefore, the size range of a blue LED chip that simultaneously meets the requirements of a light power greater than 0.45mW (operating current 1.0mA) and conforms to the requirements of close-fitting clothing can only be 8*10 mil to 10*12 mil.

[0008] Among them, 0402 is currently the smallest industrially mass-produced LED chip, with a minimum thickness of 0.3mm; its three-dimensional dimensions are 1.0*0.5*0.3mm. 0603 is second only to 0402, with three-dimensional dimensions of 1.6*0.8*0.3mm and 1.6*0.8*0.4mm. 0805 is even smaller than 0603, with three-dimensional dimensions of 2.0*1.2*0.6mm. Chip package sizes that are too large cannot meet wearable bending performance standards; therefore, the thickness range for the package size is selected as 0.3-0.6mm.

[0009] In the preferred configuration, the chip thickness should be chosen to ensure a smooth surface when embedded in clothing, without any noticeable unevenness. Comparing 0.4T and 0.6T LED chips, a 35-year-old woman and a child under 10 years old were selected to experience the touch of the 0603-0.6T and 0603-0.4T chips. Both indicated that the 0.6mm thickness provided a noticeable unevenness, while the 0.4mm thickness felt weak or nonexistent. Therefore, to further enhance the user experience, the preferred configuration is a small-pitch LED chip with a package thickness of 0.3mm to 0.4mm.

[0010] The reflective backing is made of silver, the effective illumination height of the blue LED chip is no greater than 0.5mm, and the luminous area of ​​the blue LED chip is no less than 0.051mm². 2 .

[0011] The size range of the blue LED chip is 8*10mil to 9*11mil.

[0012] The pins are made of gold plate material.

[0013] To solve the above-mentioned technical problems and achieve the above-mentioned objectives, the present invention provides a preparation method, characterized by comprising the following steps:

[0014] A. Select blue LED chips with a size range not exceeding 8*11mil;

[0015] B. Package the blue LED chip, wherein the package thickness ranges from 0.3mm to 0.6mm;

[0016] C. Install the reflective backing plate and blue LED chip in sequence on the front of the base;

[0017] D. Add SiO2 diffusing agent to the transparent cover plate to control the light emission angle of the blue LED chip to be no less than 150°, and then encapsulate the cover plate onto the front of the base described in step C;

[0018] E. Connect the base using pins.

[0019] In step A, blue LED chips with a size of 8*11mil or 8*10mil are selected.

[0020] In step B, the packaging size is selected as 0603-0.4T, 0603-0.3T, or 0402-0.3T.

[0021] The reflective backing plate is made of silver plate material.

[0022] The pins are made of gold plate material.

[0023] Compared with the prior art, the small-pitch LED beads and their preparation method of the present invention have the following beneficial effects:

[0024] 1. When the size of the blue LED chip is controlled within the range of 8*10mil to 10*12mil and the package thickness is controlled within the range of 0.3-0.6mm, the light intensity required to remove physiological jaundice can be guaranteed. It is also easy to bend and can achieve a light and thin effect, making it suitable for making wearable devices such as close-fitting clothing.

[0025] 2. Using silver plate as the material for reflective backing allows small-pitch LED beads to achieve a luminous power of 0.67mw or more with a package size of 0603-0.4T;

[0026] 3. Filling the transparent cover with SiO2 diffusing agent increases the light emission angle to over 150°, thereby ensuring an expanded irradiation area for small-pitch LED beads. This allows the blue light beads to maintain effective light intensity for fading jaundice when they are less than 0.5mm away from the skin. The use of SiO2 diffusing agent reduces the number of small-pitch LED beads and lowers the manufacturing cost.

[0027] 4. The pins use gold plates. On the one hand, the silver plate material of the reflector is compatible with the gold plate material of the pins, making it less likely for the fuse to break. On the other hand, since gold is more chemically stable than silver, the overall stability of the small-pitch LED beads is better, thereby increasing their service life.

[0028] 5. By combining the above-mentioned blue LED chip size, package thickness, filling diffuser, silver reflector and gold pin synergistic use, small-pitch LED chips suitable for making close-fitting clothing can provide sufficient light power and light area to achieve the function of removing jaundice while ensuring thinness and flexibility. Attached Figure Description

[0029] Appendix Figure 1 This is a top view of Embodiment 1 of the present invention;

[0030] Appendix Figure 2 This is a front view of Embodiment 1 of the present invention;

[0031] Appendix Figure 3 This is a partial cross-sectional view of the transparent cover plate of Embodiment 1 of the present invention;

[0032] Appendix Figure 4 This is a photoelectric test result of small-pitch LED beads when the reflective plate of the present invention is made of gold plate material and the transparent cover plate does not contain SiO2 diffusing agent.

[0033] Appendix Figure 5 This is a photoelectric test effect diagram of small-pitch LED beads with a gold plate reflector and SiO2 diffuser added to the transparent cover plate of the present invention.

[0034] Appendix Figure 6 This is a photoelectric test result of small-pitch LED beads with a silver reflector plate and a transparent cover plate containing SiO2 diffusing agent, as shown in the figure.

[0035] The labels in the diagram are as follows: 1. Blue LED chip; 2. Reflective backing plate; 3. Base; 4. Pins; 5. Transparent cover plate; 6. SiO2 diffuser. Detailed Implementation

[0036] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0037] Existing technologies have technical problems such as the large bending radius of LED beads making them unsuitable for wearable devices that fit close to the body, and the small light-emitting angle resulting in a small illumination area.

[0038] To address this, the present invention provides a small-pitch LED bead, comprising a blue LED chip 1 and a reflective substrate 2 sequentially packaged on the front side of a base 3. The front side of the base 3 is provided with a transparent cover plate 5, and pins 4 are provided on the base 3. SiO2 diffusing agent 6 is added to the transparent cover plate 5 to control the light emission angle of the blue LED chip 1 to be not less than 150°, and the thickness of the package size is in the range of 0.3-0.6 mm.

[0039] Another aspect of the present invention provides a preparation method, characterized by comprising the following steps:

[0040] A. Select blue LED chip with a size range not exceeding 8*11mil;

[0041] B. Package the blue LED chip 1, wherein the package thickness ranges from 0.3mm to 0.6mm;

[0042] C. Install the reflector plate 2 and the blue LED chip 1 sequentially on the front of the base 3;

[0043] D. Add SiO2 diffuser 6 to the transparent cover plate 5 to control the light emission angle of the blue LED chip 1 to be no less than 150°, and then encapsulate the cover plate onto the front of the base 3 described in step C.

[0044] E. Connect base 3 using pin 4.

[0045] Example 1:

[0046] Figures 1 to 6 An embodiment of the small-pitch LED bead of the present invention is presented.

[0047] Please refer to Figure 1 and Figure 2As shown, an embodiment of the present invention discloses a small-pitch LED bead, including a blue LED chip 1 and a reflective plate 2 sequentially encapsulated on the front side of a base 3. The reflective plate 2 is used to reflect the blue light emitted by the blue LED chip 1 to enhance the light power of the small-pitch LED. At the same time, a transparent cover plate 5 is also provided on the front side of the base 3, so as to accommodate the blue LED chip 1 and the reflective plate 2 in the cavity formed by the base 3 and the transparent cover plate 5. The transparent cover plate 5 is made of a transparent material, preferably a transparent plastic, to ensure that the blue light emitted by the blue LED chip 1 is emitted from the cavity.

[0048] The side of the base 3 facing the user's skin is the front, and the side opposite the front is the back.

[0049] The specific working process of small-pitch LED beads is as follows: pin 4 is connected to blue light bead chip 1 through wire. After power is turned on, blue light bead chip 1 emits forward light towards the user and reverse light away from the user. The reverse light is reflected by the reflective plate 2 and merges with the forward light. It shines on the user's skin through the transparent cover plate 5, forming a light irradiation to lighten the jaundice of newborns.

[0050] refer to Figure 3 In this embodiment, SiO2 diffuser 6 is filled into the transparent cover plate 5, and the transparent cover plate 5 is changed from a transparent state to a matte state.

[0051] like Figure 4 The test diagram of a small-pitch LED bead with package type 0603-0.4T, gold reflective plate 2, and no SiO2 diffusing agent 6 added to transparent cover plate 5 is shown. Its luminous flux is 0.137 lm, luminous efficiency is 68.5 lmw, and luminous power is 0.4 mw.

[0052] like Figure 5 The image shows a test diagram of a small-pitch LED with package type 0603-0.4T, gold reflective substrate 2, and SiO2 diffuser 6 added to transparent cover 5. The LED has a luminous flux of 0.148 lm, a luminous efficiency of 74 lmw, and a luminous power of 0.43 mw.

[0053] Therefore, under the same conditions, simply adding SiO2 diffusing agent 6 to the transparent cover plate 5 can increase the luminous flux, luminous efficiency, and luminous power. When the transparent cover plate 5 is in a transparent state, the emission angle is 120°. When the transparent cover plate 5 is in a frosted state, the emission angle is further diffused and is not less than 150°. This ensures that the small-pitch LED beads are transformed from point light sources to surface light sources, and that the effective light intensity is guaranteed within a contact thickness of less than 0.5mm. The use of SiO2 diffusing agent 6 reduces the number of small-pitch LED beads and lowers the manufacturing cost when making wearable devices.

[0054] In existing technologies, LED chips either have excessively large package sizes, leading to a correspondingly large bending radius, which can cause damage to the chips and FPC boards due to insufficient bending performance during the fabrication of wearable devices; or their package sizes are too small, resulting in insufficient light intensity (referencing the conventional phototherapy standard of 6μW / nm·cm). 2 ~12μW / nm·cm 2 This method cannot effectively reduce jaundice in newborns.

[0055] Therefore, by selecting an appropriate packaging size without affecting the production of close-fitting wearable equipment, the light power can be enhanced by adding SiO2 diffusing agent 6 to the transparent cover plate 5, thereby achieving effective jaundice reduction for newborns.

[0056] Existing LED lamp beads either have insufficient light intensity (referencing the conventional phototherapy standard of 6μW / nm·cm) 2 ~12μW / nm·cm 2 It cannot effectively reduce jaundice in newborns. Either the fabric is made into close-fitting clothing with insufficient bending performance, which easily damages the LED beads and FPC board, or the fabric is made into close-fitting clothing with obvious concave and convex textures, as well as obvious indentations or scratches.

[0057] Therefore, the size range of the blue LED chip 1 is limited to 8*10mil to 10*12mil. When the size is smaller than 8*10mil, the blue LED chip cannot generate a light power greater than 0.45mW (operating current 1.0mA) under the current industrial manufacturing capabilities. When the size is larger than 10*12mil, it affects the die bonding, wire bonding and cutting processes in the packaging process, thereby reducing production efficiency and light output efficiency. Therefore, the size range of the blue LED chip that has a light power greater than 0.45mW (operating current 1.0mA) and meets the requirements of wearing close-fitting clothing can only be 8*10mil to 10*12mil.

[0058] In the preferred configuration, the size of the blue LED chip 1 can be 8*10mil, 8*11mil, 8*12mil, 9*12mil, 10*10mil, or 10*12mil, with a wavelength range of 470-490nm. Under current production conditions, only the 8*11mil blue LED chip 1 is available in bulk on the market, while the others need to be obtained through customization.

[0059] Among them, the several small-pitch LED beads arranged in the wearable device can be set as small-pitch LED beads with a uniform package size, or small-pitch LED beads with different package sizes can be set in the wearable device. Wearable devices are generally made of flexible materials or may be items such as wristbands.

[0060] Among them, the material of the reflective backing plate 2 is set to silver plate.

[0061] like Figure 5 The image shows a test result for a small-pitch LED with package type 0603-0.4T, a gold reflective substrate 2, and SiO2 diffusing agent 6 added to the transparent cover 5. The result shows a luminous flux of 0.148 lm, a luminous efficacy of 74 lmw, and a light power of 0.43 mw. The light power of 0.43 mw only reaches the lower limit of the conventional phototherapy standard, which is 6 μW / nm·cm. 2 ~12μW / nm·cm 2 If individual small-pitch LED beads are damaged or their luminous efficacy decreases over time, the equipment cannot guarantee the lighting effect and thus cannot meet the requirements for yellowing removal.

[0062] However, as Figure 6 The image shows a test diagram of a small-pitch LED bead with a package model of 0603-0.4T, a silver reflective substrate 2, and SiO2 diffuser 6 added to the transparent cover 5. Its throughput is 0.096 lm, luminous efficiency is 48 lmw, and luminous power is 0.67 mw. In particular, the luminous power can be significantly improved and can reach 0.67 mw, so even with the loss of individual small-pitch LED beads, the light intensity requirements can be guaranteed.

[0063] When the blue LED chip 1 is selected as 8*11mil, the small-pitch LED chip package size is 0603-0.4T, 0603-0.3T, or 0402-0.3T, and the SiO2 diffusing agent 6 is filled into the transparent cover plate 5 and the reflective backing plate 2 is set as a silver plate material, the parameters of this small-pitch LED chip can achieve the following: blue light wavelength is effective in the range of 420-490nm, with the optimal range of 460-490nm; optical power is 0.42-0.9mW; bending radius is ≤1.6mm; effective illumination height is ≤0.5mm; luminous area is ≥0.051mm2; and luminous angle is ≥150°.

[0064] Among them, pin 4 is made of gold plate material. On the one hand, the silver plate material of reflective backing plate 2 is compatible with the gold plate material of pin 4, making it less likely for the fuse to break. On the other hand, since gold element has greater chemical stability than silver element, the overall stability of small-pitch LED beads is better, thereby increasing their service life. Pin 4 generally includes external pin 4 and bottom pin 4 set on base 3, where both external pin 4 and bottom pin 4 are made of gold plate material.

[0065] Therefore, when the small-pitch LED beads with the features of this embodiment are connected in series and / or in parallel and then assembled into a wearable device mainly made of flexible materials, their wavelength range and light intensity are suitable for fading mild and moderate jaundice in newborns, and the size of the small-pitch LED beads can also meet the bending performance standards of the wearable device, and the thickness and light range of the small-pitch LED beads can meet the requirements of fitting the skin.

[0066] Example 2

[0067] An embodiment of the present invention discloses a method for preparing small-pitch LED beads, characterized by comprising the following steps:

[0068] A. Select blue LED chip with a size range not exceeding 8*11mil;

[0069] B. Package the blue LED chip 1, wherein the package thickness ranges from 0.3mm to 0.6mm;

[0070] C. Install the reflector plate 2 and the blue LED chip 1 sequentially on the front of the base 3;

[0071] D. Add SiO2 diffuser 6 to the transparent cover plate 5 to control the light emission angle of the blue LED chip 1 to be no less than 150°, and then encapsulate the cover plate onto the front of the base 3 described in step C.

[0072] E. Connect base 3 using pin 4.

[0073] When the small-pitch LED beads produced by the above steps are connected in series and / or in parallel and then assembled into wearable devices mainly made of flexible materials, their wavelength range and light intensity are suitable for fading mild and moderate jaundice in newborns. The size of the small-pitch LED beads can also meet the bending performance standards of wearable devices, and the thickness and light range of the small-pitch LEDs can meet the requirements of skin contact.

[0074] In the embodiments of the present invention, when the principle analysis, materials, structure and preparation method of the blue LED chip 1 are the same, the larger the chip size, the greater its luminous power. However, when the size is too large, it will affect the die bonding, wire bonding and cutting processes in the packaging process, thereby reducing production efficiency and light output efficiency. Therefore, the size range of the blue LED chip 1 is designed to be no greater than 8*11mil.

[0075] When the size is less than 8*10mil, the blue light chip cannot generate a light power greater than 0.45mW (operating current 1.0mA) under the existing industrial manufacturing capabilities. Therefore, the size range of the blue light chip 1 is further designed to be 8*10mil to 8*11mil. In the preferred state, a blue light chip 1 with a size of 8*11mil or 8*10mil is selected.

[0076] In the embodiments of this invention, the package size and thickness of the small-pitch LED chips range from 0.3mm to 0.6mm. 0402 is currently the smallest industrially mass-produced LED chip, with a minimum thickness of 0.3mm; its three-dimensional dimensions are 1.0*0.5*0.3mm. 0603 is second only to 0402, with three-dimensional dimensions of 1.6*0.8*0.3mm and 1.6*0.8*0.4mm. 0805 is even smaller than 0603, with three-dimensional dimensions of 2.0*1.2*0.6mm. Chip package sizes that are too large cannot meet wearable bending performance standards; therefore, this embodiment selects package sizes with a thickness of 0.3mm to 0.6mm.

[0077] In the preferred configuration, the chip thickness should be selected to ensure that the surface of the embedded clothing device is smooth and without any noticeable bumps or unevenness.

[0078] Comparing 0.4T and 0.6T LED chips, a 35-year-old woman and a child under 10 years old were selected to experience the touch of the 0603-0.6T and 0603-0.4T chips. Both indicated that the 0.6mm thickness had a noticeable bumpy feel, while the 0.4mm thickness had a weak or no feel. Therefore, to further enhance the user experience, Mini LED chips with a package thickness of 0.3mm to 0.4mm were selected. In the existing technology, the available models for small-pitch LED chips with a package thickness of 0.3mm to 0.4mm are 0603-0.4T, 0603-0.3T, or 0402-0.3T.

[0079] In an embodiment of the present invention, SiO2 diffuser 6 is filled into a transparent cover plate 5, and the transparent cover plate 5 is changed from a transparent surface state to a matte surface state.

[0080] like Figure 4 The test diagram of a small-pitch LED bead with package type 0603-0.4T, gold reflective plate 2, and no SiO2 diffusing agent 6 added to transparent cover plate 5 is shown. Its luminous flux is 0.137 lm, luminous efficiency is 68.5 lmw, and luminous power is 0.4 mw.

[0081] like Figure 5 The image shows a test diagram of a small-pitch LED with package type 0603-0.4T, gold reflective substrate 2, and SiO2 diffuser 6 added to transparent cover 5. The LED has a luminous flux of 0.148 lm, a luminous efficiency of 74 lmw, and a luminous power of 0.43 mw.

[0082] Therefore, under the same conditions, simply adding SiO2 diffusing agent 6 to the transparent cover plate 5 can increase the luminous flux, luminous efficiency, and luminous power. When the transparent cover plate 5 is in a transparent state, the emission angle is 120°. When the transparent cover plate 5 is in a frosted state, the emission angle is further diffused and is not less than 150°. This ensures that the small-pitch LED beads are expanded from point light sources to surface light sources, and that the effective light intensity is guaranteed within a contact thickness of less than 0.4mm. The use of SiO2 diffusing agent 6 reduces the number of small-pitch LED beads and lowers the manufacturing cost when making wearable devices.

[0083] In existing technologies, LED chips either have excessively large package sizes, leading to a correspondingly large bending radius that results in chip breakage due to insufficient bending performance during the fabrication of wearable devices; or their package sizes are too small, resulting in insufficient light intensity (referencing the conventional phototherapy standard of 6μW / nm·cm). 2 ~12μW / nm·cm 2 This method cannot effectively reduce jaundice in newborns.

[0084] Therefore, by selecting an appropriate packaging size without affecting the production of close-fitting wearable equipment, the light power can be enhanced by adding SiO2 diffusing agent 6 to the transparent cover plate 5, thereby achieving effective jaundice reduction for newborns.

[0085] In an embodiment of the present invention, the reflective backing plate 2 is made of silver.

[0086] like Figure 5 The image shows a test result for a small-pitch LED with package type 0603-0.4T, a gold reflective substrate 2, and SiO2 diffusing agent 6 added to the transparent cover 5. The result shows a luminous flux of 0.148 lm, a luminous efficacy of 74 lmw, and a light power of 0.43 mw. The light power of 0.43 mw only reaches the lower limit of the conventional phototherapy standard, which is 6 μW / nm·cm. 2 ~12μW / nm·cm 2 If individual Mini LED beads are damaged or their luminous efficacy decreases over time, the equipment cannot guarantee the lighting effect and thus cannot meet the requirements for yellowing removal.

[0087] However, as Figure 6The image shows a test diagram of a small-pitch LED bead with a package model of 0603-0.4T, a silver reflective substrate 2, and SiO2 diffuser 6 added to the transparent cover 5. Its throughput is 0.096 lm, luminous efficiency is 48 lmw, and luminous power is 0.67 mw. In particular, the luminous power can be significantly improved and can reach 0.67 mw, so even with the loss of individual small-pitch LED beads, the light intensity requirements can be guaranteed.

[0088] Therefore, when the blue LED chip 1 is selected as 8*11mil, the small-pitch LED chip package size is 0603-0.4T, 0603-0.3T, or 0402-0.3T, and the SiO2 diffusing agent 6 is filled into the transparent cover plate 5 and the reflective backing plate 2 is set as a silver plate material, the parameters of this small-pitch LED chip can achieve the following: blue light wavelength is effective in the range of 420-490nm, with the optimal range being 460-490nm; optical power is 0.42-0.9mW; bending radius is ≤1.6mm; effective illumination height is ≤0.5mm; luminous area is ≥0.051mm2; and luminous angle is ≥150°.

[0089] In an embodiment of the present invention, pin 4 is made of gold plate material. On the one hand, since the silver plate material of the reflective backing plate 2 is compatible with the gold plate material of pin 4, fuse breakage is less likely. On the other hand, since gold has greater chemical stability than silver, the overall stability of the small-pitch LED bead is better, thereby increasing its service life. Pin 4 generally includes an outer pin 4 and a bottom pin 4 disposed on the base 3, wherein both the outer pin 4 and the bottom pin 4 are made of gold plate material.

[0090] By combining the aforementioned blue LED chip size, package thickness, filler diffuser, silver reflector, and gold pin synergistic use, Mini LED chips suitable for manufacturing close-fitting clothing can provide sufficient light power and illumination area to achieve the function of fading jaundice while ensuring they are thin, flexible, and lightweight.

[0091] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0092] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0093] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for preparing small-pitch LED beads, characterized in that, Includes the following steps: A. Select size 8 11mil~10 12mil blue LED chip; B. Package the blue LED chip, wherein the package thickness ranges from 0.3mm to 0.6mm; the package size is selected as 0603-0.4T, 0603-0.3T, or 0402-0.3T; C. Install the reflective backing plate and blue LED chip in sequence on the front of the base; D. Add SiO2 diffusing agent to the transparent cover plate to change the transparent cover plate from a transparent state to a matte state; control the light emission angle of the blue LED chip to be no less than 150° to ensure that the small-pitch LED chips are expanded from point light sources to surface light sources, and ensure the effective light intensity of yellowing within a contact thickness of less than 0.5mm; and encapsulate the transparent cover plate onto the front of the base described in step C. E. Connect the base using pins; The obtained small-pitch LED beads include blue LED chip and reflective plate sequentially packaged on the front of the base. The front of the base is provided with a transparent cover plate and pins are provided on the base. The transparent cover has a sidewall connected to the base, and the sidewall is configured as an inclined wall that is tilted toward the center of the LED chip. The transparent cover is made of transparent plastic; The blue LED chip and reflector are housed in the cavity formed by the base and the transparent cover. The reflective backing is made of silver. The obtained small-pitch LED beads have a blue light wavelength of 420~490nm; optical power of 0.42~0.9mW; bending radius ≤1.6mm; effective illumination height ≤0.5mm; and luminous area ≥0.051mm². 2 ; The small-pitch LED beads are used to manufacture wearable devices such as close-fitting clothing.

2. The method for preparing small-pitch LED beads according to claim 1, characterized in that, The size range of the blue LED chip is 8. 11mil to 9 11mil.

3. The method for preparing small-pitch LED beads according to claim 1, characterized in that: The pins are made of gold plate material.

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