TW201740579A - Light-emitting diode assembly - Google Patents

Abstract

An LED assembly includes a substrate, an LED chips, a first electrode and a second electrode. The substrate has a first surface and a second surface opposite to the first surface. The LED chip and the first electrode are formed on the first surface. The second electrode is formed on the second surface. In a cross-sectional view, the first electrode and the second electrode have different length.

Description

Light-emitting diode assembly

Embodiments of the invention relate to a light emitting diode (LED) component and method of fabrication, and more particularly to LED components that provide a full perimeter light field and associated methods of fabrication.

At present, you can already see the application of various LED products, such as traffic locomotive taillights, car headlights, street lights, computer lights, flashlights, LED backlights, etc. In addition to the front-end wafer processing, these products almost all have to go through the back-end packaging process.

The main function of the LED package is to provide the necessary support for LED chip power, light and heat. Semiconductor products such as LED wafers, if exposed to the atmosphere for a long time, may be affected by moisture or environmental chemicals, causing deterioration in characteristics. In the LED package, epoxy resin is commonly used to coat the LED chip to effectively isolate the atmosphere. In addition, in order to achieve a brighter and more power-saving goal, LED packaging also needs good heat dissipation and light extraction efficiency. If the heat generated when the LED chip emits light is not released in time, the heat accumulated in the LED chip adversely affects the characteristics, lifetime, and reliability of the device. Optical design is also an important part of the LED packaging process. How to more effectively derive light, the angle of illumination and the direction are the design priorities.

White LED packaging technology, in addition to heat issues, also need to consider color temperature (color temperature), color rendering index, fluorescent powder and other issues. Moreover, if the white LED is a blue LED chip with a yellow-green phosphor, the shorter the wavelength of the blue light, the greater the damage to the human eye, so it is necessary to effectively block the blue light in the package structure and avoid blue light leakage.

In order for LED products to be competitive in the market, how to make the LED package process stable, low cost and high yield is also the goal pursued by LED packaging.

A light emitting diode assembly includes: a substrate, a light emitting diode chip, a first electrode, and a second electrode. The substrate has a first surface and a second surface opposite the first surface. The light emitting diode chip and the first electrode are located on the first surface. A second electrode is formed on the second surface and is in electrical connection with the first electrode. In a cross section, the first electrode and the second electrode have different lengths.

1 is a perspective view of a light-emitting diode (LED) assembly 100 in accordance with an embodiment of the present invention. The LED assembly 100 includes a transparent substrate 106, which in one embodiment is a non-conductive glass substrate. The transparent substrate 106 has an upper surface 102 and a lower surface 104 that face opposite directions. As shown in FIG. 1, the transparent substrate 106 has a substantially elongated shape and has two terminals 114 and 116. In this specification, transparency is only used to mean that light is transmitted through, which may be transparent or translucent, or semi-transparent. In another embodiment, the material of the transparent substrate 106 may be sapphire, tantalum carbide, or diamond-like carbon.

Figure 2A shows a top view of LED assembly 100a. Please also refer to Figure 1. On the upper surface 102, a plurality of blue LED chips 108 are fixed and electrically connected to each other through a line formed by a bonding wire 110. Each of the blue LED chips 108 can be a single LED having a forward voltage of about 2 to 3 V (hereinafter referred to as a "low voltage wafer"), or having a plurality of light emitting diodes connected in series and having a forward voltage system greater than a low voltage. Voltage chips, such as 12V, 24V, 48V, etc. (hereinafter referred to as "high voltage chips"). Specifically, unlike the wire bonding method, the high voltage chip is formed by a semiconductor process on a common substrate to form a plurality of light emitting diode units electrically connected to each other (ie, a light emitting diode structure having at least a light emitting layer). The common substrate may be a long crystal substrate or a non-long crystal substrate. In FIGS. 1 and 2A, the blue LED chip 108 is arranged in two rows along the two sides of one of the longitudinal ends of the two terminals 114 and 116 connecting the transparent substrate 106, and is connected in series with each other by the bonding wires 110. Upper, equivalent to a high forward voltage LED. However, the present invention is not limited thereto. In other embodiments, the blue LED chips 108 on the upper surface 102 may be arranged in any pattern, and the electrical connections to each other may have, be connected in series, in parallel, and simultaneously connected in series and in parallel. Or the connection method of the bridge structure.

As shown in FIG. 2A, the transparent substrate 106 has a via hole 107 near the terminal 114. The via hole 107 has a through hole penetrating through the transparent substrate 106 to the upper surface 102 and the lower surface 104, and a conductive material is formed to fill the through hole or cover only the inner wall of the through hole to form the via hole 107. The conductive body in the through hole can provide electrical connection between the two ends of the via hole 107. A conductive electrode plate 118 is disposed adjacent the upper surface 102 of the terminal 114. The conductive electrode plate 118 does not directly contact the via hole 107, that is, does not directly contact the conductive material in the via hole. One of the blue LED chips 108 (labeled 108a) near the terminal 114 is electrically connected to the conductive electrode plate 118 by a bonding wire 110. One of the blue LED chips 108 near the terminal 114 (labeled 108b) is electrically connected to the via 107 with another bonding wire 110.

All of the bonding wires 110 and the blue LED chips 108 on the upper surface 102 are covered by the transparent colloid 112 to prevent moisture or chemical substances in the atmosphere from aging the bonding wires 110 and the blue LED chips 108. damage. The main constituent of the transparent colloid 112 may be epoxy resin or silicone. The transparent colloid 112 comprises at least one phosphor powder which can be excited by a part of the blue light emitted by the blue LED chip 108 (for example, its peak value is 430 nm-480 nm) to generate yellow light (for example, its peak value is 570 nm-590 nm). ) or yellow-green light (for example, its peak value is 540nm-570nm). When the yellow or yellow-green light is properly mixed with the remaining blue light, the human eye will be regarded as white light. Figure 1 is just a schematic diagram. In an example, the LED assembly 100 of FIG. 1 may not be able to see the bonding wire 110 and the blue LED wafer 108 under the transparent colloid 112 as shown in FIG. 1 because of the phosphor in the transparent colloid 112.

Figure 2B shows a bottom view of the LED assembly 100a. As shown in Fig. 2B, no LED chip is placed on the lower surface 104. On the lower surface 104 of the terminal 114, another conductive electrode plate 120 is disposed, a portion of which overlaps the via hole 107 and directly contacts the conductive material in the through hole to be electrically connected thereto. However, in another embodiment, the conductive electrode plate 120 may not be directly connected to the via hole 107, but may be electrically connected to the via hole 107 through another conductor such as the bonding wire 110. On the lower surface 104 of the terminal 116, another conductive electrode plate 122 may be selectively disposed. Such a design can make the conductive electrode plate 122 and the conductive electrode plate 120 coplanar, whereby the LED assembly 100a can be placed relatively stably, and can avoid damage caused by falling during transportation or handling. In this embodiment, the conductive electrode plate 122 may be a floating connection on the circuit, and is not electrically connected to any electronic component, circuit, or other electrode plate in the LED assembly 100a, because its main purpose is to enable the LED assembly 100a to Place it smoothly.

As shown in the embodiments of Figures 2A and 2B, the boundaries of the conductive electrode plates 120 and 118 are located within the lower surface 104 and the upper surface 102, i.e., substantially no more than the boundary between the lower surface 104 and the upper surface 102. The shapes of the conductive electrode plates 120, 118 and 122 need not be approximately rectangular, and the sizes do not need to be substantially the same. In another embodiment, one of the conductive electrode plates 120 and 118 is generally rectangular and the other is substantially circular to facilitate identification of the positive and negative electrodes of the LED assembly 100a.

Electrically, the blue LED chip 108 and the via 107 are connected in series between the conductive electrode plates 120 and 118. Conductive electrode plates 120 and 118 can serve as two power input terminals for LED assembly 100a. A positive power supply terminal and a negative power supply terminal of a driving power source (not shown) may be electrically connected to the conductive electrode plates 120 and 118, respectively, to drive the blue LED chip 108 to emit light.

Fig. 3A is a cross-sectional view showing the AA of the LED assembly 100a in Fig. 2A; and Fig. 3B is a cross-sectional view showing the BB of the LED assembly 100a in Fig. 2A.

Similar to the foregoing, in FIG. 3A, the blue LED chip 108b is electrically connected to the via 107 through a bonding wire 110, which is connected to the conductive electrode plate 120 of the lower surface 104; in FIG. 3B, the blue LED The wafer 108a is electrically connected to the conductive electrode plate 118 on the upper surface 102 through another bonding wire 110. 4 shows that the LED assembly 100 is disposed in a light bulb that includes a light cover 180, an LED assembly 100, a circuit board 192, a heat dissipation mechanism 182, and an electrical connection mechanism 183 (eg, an Edison base). The terminal 114 of the LED assembly 100 is fixed on the circuit board 192; the circuit board 192 is connected to the heat dissipation mechanism 182 for connecting the tropical light bulb generated by the LED assembly 100; the electrical connection mechanism 183 to the heat dissipation mechanism 182. Since the conductive electrode plates 120 and 118 for driving the blue LED chip 108a are respectively located on the upper surface 102 and the lower surface 104 of the same terminal 114 side of the transparent substrate 106, the conductive electrode plate 120 can be electrically connected with a conductor such as solder. 118 is soldered to a circuit board as shown in Figure 5A. The solder 190 can not only provide an electrical connection of the driving power source to cause the LED assembly 100 to emit light, but also provide mechanical support to the terminal 114, so that the LED assembly 100 vertically stands on the circuit board 192 and emits light around the periphery to provide full-circumference light. field. In FIG. 5A, the LED assembly 100 is supported only by the mechanism of the solder 190, and can stand substantially vertically on the circuit board 192. The circuit board 192 simultaneously supplies power to the LED assembly 100 through the solder 190. Fig. 5B is a clip formed by a metal clip 194 which is clamped to the LED assembly 100 and fixed approximately perpendicularly to the circuit board 192. The metal clip 194 provides both power supply and mechanism fixing functions, and can also reduce the complexity and cost of the manufacturing process. However, the LED assembly 100 can also be obliquely inserted into the circuit board 192 in a non-vertical manner.

In the embodiment of FIG. 3A, a vertical conduction element 130 may be disposed at a position of the via 107 of the upper surface 102 as an electrical connection between the via 107 and a bonding wire 110. For example, the vertical conducting element 130 is a pn junction diode (eg, a vertical LED, a Schottky diode, or a Zener diode), a resistor, or a metal block to conduct silver. Adhesively on the via 107. In another embodiment, the vertical conductive element 130 and the conductive silver paste may be omitted, and a bonding wire 110 may directly contact the via hole 107 to generate an electrical connection.

In FIGS. 3A and 3B, each of the blue LED chips 108 has a transparent adhesive layer 132 for fixing the blue LED wafer 108 to the upper surface 102 of the transparent substrate 106. In FIGS. 3A and 3B, each of the blue LED chips 108 has a corresponding one of the transparent adhesive layers 132 in a one-to-one relationship with each other, but the present invention is not limited thereto. In one embodiment, the upper surface 102 has a plurality of transparent adhesive layers 132, and each of the transparent adhesive layers 132 has a plurality of blue LED chips 108 adhered thereto; in another embodiment, the upper surface 102 has only a single transparent adhesive layer. 132, on which all of the blue LED chips 108 are carried. The larger the area of the transparent adhesive layer 132, the better the heat dissipation effect on the blue LED chip 108 thereon, but the disadvantage of the greater the shear due to the difference in thermal expansion coefficient. Therefore, the size of the transparent adhesive layer 132, as well as the number of blue LED chips 108 carried, may depend on the actual application. In one embodiment, the transparent adhesive layer 132 is mixed with some high thermal conductivity thermal conductive particles, such as alumina powder, diamond-like carbon, or tantalum carbide (SiC), which has a thermal conductivity greater than 20 W/ mK, in addition to improving the heat dissipation effect, can also have the effect of light scattering.

In FIGS. 3A and 3B, the material of the transparent adhesive layer 132 may be, for example, an epoxy resin or a silicone, and mixed with the same, similar or different ones as the transparent colloid 112. Fluorescent powder. For example, the phosphor powder can be YAG or TAG phosphor. As previously described, the transparent colloid 112 with phosphor powder covers the perimeter and top of the bond wire 110 and the blue LED wafer 108, while the transparent adhesive layer 132 is positioned below the blue LED wafer 108. In other words, each of the blue LED chips 108 is not only covered by the transparent colloid 112 and the transparent adhesive layer 132, but is also substantially completely wrapped by a transparent capsule 112 and a transparent adhesive layer 132 formed by a transparent package. . The blue light emitted by the blue LED chip 108 is not converted into yellow-green light by the phosphor powder, or mixed with yellow-green light. Therefore, the LED assembly 100a in FIGS. 3A and 3B can prevent the problem of leakage of blue light.

Fig. 6 shows a manufacturing method for forming the LED assembly 100a in Figs. 3A and 3B. First, a transparent substrate 106 is provided. A via hole 107 is formed in advance on the transparent substrate 106 (step 148). For example, a through hole may be melted from the glass substrate transparent substrate 106 by laser light, and then a conductive material may be filled in the through hole to form the via hole 107. Step 150 pre-cuts the transparent substrate 106. A plurality of trenches are formed on the transparent substrate 106, and the position of each of the LED components 100 on the transparent substrate 106 is roughly pre-defined to facilitate subsequent cutting. Step 152 attaches the conductive electrode plates 118 and 120 to the transparent substrate 106, respectively, near the upper surface 102 and the lower surface 104 of the terminal 114. If there is a conductive electrode plate 112, step 152 also forms it on the transparent substrate 106. In another embodiment, the conductive electrode plates are formed on the upper surface 102 or the lower surface 104 by printing. Step 154 forms a transparent adhesive layer 132 having phosphor powder on the upper surface 102, the position of which is first designed to place the blue LED wafer 108 thereon. The transparent adhesive layer 132 is formed by, for example, forming a transparent adhesive layer 132 on the upper surface 102 by dispensing, printing or spraying.

Step 155 secures the blue LED wafer 108 to the transparent adhesive layer 132. For example, the blue LED wafer 108 can be sucked up from the blue tape by a vacuum nozzle and placed on the transparent adhesive layer 132. Preferably, the position of the blue LED chip 108 is completely surrounded by the periphery of a transparent adhesive layer 132, that is, the area of the transparent adhesive layer 132 is larger than the area of the blue LED chip 108 to avoid the problem of blue light leakage. The vertical conductive element 130 can be adhered to the via 107 of the upper surface 102 by conductive silver at this time. Step 156 forms bond wire 110, electrically connecting a blue LED die 108 to another blue LED die 108, blue LED die 108a to conductive electrode pad 118, and blue LED die 108b to vertical pass element 130. Step 157 may be formed by dispensing or printing a transparent colloid 112 having a phosphor powder on the upper surface 102 to cover the bonding wire 110 and the blue LED wafer 108. Step 158 may separate the individual LED assemblies 100 along the previously preformed trenches by manual or machine cutting.

As is apparent from the process of FIG. 6, in the formation of the LED assembly, in addition to forming the conductive electrode plate 120 or 122 on the lower surface 104, the other steps are generally performed on the upper surface 102. Since the lower surface 104 has only a large area of the conductive electrode plate and is not easily scratched, the process carrier can carry or fix the transparent substrate 106 by adsorbing or holding the lower surface 104 to avoid The delicate structure on the upper surface 102 is damaged by mechanical stresses such as friction and scratches. Process yield can be considerably improved.

In the embodiments of FIGS. 3A, 3B, and 6, the light-emitting direction of the blue LED wafer 108 is not subject to any limitation. For the lower part, the blue LED chip 108 can provide the mixed light through the transparent adhesive layer 132 and the transparent substrate 106; for the periphery and above, the blue LED wafer 108 can also provide the mixed light through the transparent colloid 112. Therefore, the LED assembly 100a can be regarded as a light-emitting element that can provide six-sided illumination, and the bulb with the LED assembly 100 in FIG. 4 can be regarded as an Omnidirectional illumination device.

In FIGS. 2A, 2B, 3A and 3B, the blue LED chip 108 is directly adhered to the transparent substrate 106 with the transparent adhesive layer 132, but the present invention is not limited thereto. Figures 7A and 7B show, respectively, a top view and a bottom view of the LED assembly 100b in another embodiment. The two cross-sectional views of the LED assembly 100b are shown in Figures 8A and 8B. Fig. 9 shows a manufacturing method of the LED assembly 100b. Figures 7A, 7B, 8A, 8B, and 9 are similar and corresponding to Figures 2A, 2B, 3A, 3B, and 6, respectively, wherein the same symbols or symbols correspond to elements, devices, or steps that have similar or identical Component, device or step. For the sake of brevity, the explanation may be omitted in this specification.

Unlike FIG. 2A, FIG. 7A has a submount 160 placed within the periphery of the transparent adhesive layer 132 sandwiched between the blue LED wafer 108 and the transparent adhesive layer 132. The material of the sub-substrate 160 may be transparent glass, sapphire, tantalum carbide, or diamond-like carbon. Different from the 3A and 3B, some or all of the blue LED chips 108 in FIGS. 8A and 8B are fixed on the sub-substrate 160, and the sub-substrate 160 is fixed on the transparent substrate 106 with the transparent adhesive layer 132. .

In Fig. 9, step 154a and step 155a replace step 154 and step 155 in Fig. 6, respectively. Step 154a fixes the sub-substrate 160 to the transparent substrate 106 with a transparent adhesive layer 132 having phosphor powder. In one embodiment, the transparent adhesive layer 132 is first formed on the back surface of the sub-substrate 160, and then the sub-substrate 160 is attached to the transparent substrate 106. In another embodiment, the transparent adhesive layer 132 is first coated on the transparent substrate. On the upper surface 102 of the 106, the sub-substrate 160 is then attached to the transparent adhesive layer 132. Step 155a then affixes the blue LED wafer 108 to the submount 160.

In the embodiments of FIGS. 7A, 7B, 8A, 8B and 9, the blue LED chip 108 may be attached to the sub-substrate 160 with the same or similar material as the transparent adhesive layer 132. However, the present invention is not limited thereto. In one embodiment, the blue LED chip 108 may be fixed to the sub-substrate 160 with a phosphor-free transparent paste or a eutectic metal. In another embodiment, the sub-substrate 160 is printed with a conductive strip, and the blue LED chip 108 is fixed thereon by a flip chip. Therefore, step 156 in FIG. 9 may be omitted. The blue LED chip 108b still needs to be electrically connected to the via hole 107 through the bonding wire 100; and the blue LED chip 108a also needs to be electrically connected to the conductive electrode plate 118 through the bonding wire 100. In another embodiment, the blue LED chip 108 is affixed to the sub-substrate 160 by an anisotropic conductive film (ACF).

The LED assembly 100b of Figures 7A, 7B, 8A, 8B and 9 enjoys the same benefits as the LED assembly 100a of Figures 2A, 2B, 3A, 3B and 6. For example, the terminal 114 of the LED component 100b can be fixed on a circuit board by solder alone and simultaneously provide an electrical connection of the driving power source; the lower surface 104 of the LED component 100b is relatively not afraid of scratching, and the process yield can be effectively improved. The LED assembly 100b can be adapted to be a full-circumference illumination device; the LED assembly 100b can alleviate or eliminate the problem of blue light leakage.

8C and 8D show two cross-sectional views of the LED assembly 100c, which are variants of Figs. 8A and 8B, respectively. The LED assembly 100b (in Figures 8A and 8B) employs a single transparent adhesive layer 132 to secure the secondary substrate 160 to the transparent substrate 106. Unlike the LED assembly 100b, the LED assembly 100c (in panels 8C and 8D) is affixed to the transparent substrate 106 by two transparent adhesive layers 132 and 133. At least one of the transparent adhesive layers 132 and 133 contains a phosphor powder. In the 8C and 8D embodiments, the transparent adhesive layer 132 has a phosphor powder, and the transparent adhesive layer 133 does not. The material of the transparent adhesive layer 133 may be, for example, an epoxy resin or a silicone. Since the transparent adhesive layer 133 has no fluorescent powder, it can provide a relatively good adhesion effect and adhere to the transparent substrate 106. The transparent adhesive layers 132, 133 can be the same or different materials. In another embodiment, another transparent adhesive layer 133 may be formed between the sub-substrate 160 and the transparent adhesive layer 132 to increase the adhesion between each other.

The blue LED chips 108 in the light emitting diode assembly 100 of Fig. 1 are electrically connected to each other through the bonding wires 110, but the present invention is not limited thereto. FIG. 10 is a perspective view of a light emitting diode assembly 400 in accordance with an embodiment of the present invention, wherein the blue LED chip 108 is fixed to the upper surface 102 in a flip chip manner. 11A and 11B show top and bottom views of the LED assembly 400a. Fig. 12A is a cross-sectional view showing the AA of the LED assembly 400a in Fig. 11A; and Fig. 12B is a cross-sectional view showing the BB of the LED assembly 400a in Fig. 11A. The figures 10, 11A, 11B, 12A and 12B are similar to the corresponding figures 1, 2A, 2B, 3A and 3B, respectively, wherein the same symbols or symbols correspond to the elements, devices or steps, which have similar or identical Component, device or step. For the sake of brevity, the explanation may be omitted in this specification.

12A and 12B are different from FIGS. 3A and 3B. In FIGS. 12A and 12B, the transparent substrate 106 is printed with the conductive strips 402, and the blue LED chips 108 are electrically connected to each other through the conductive strips 402. connection. Therefore, the blue LED chip 108 in FIGS. 12A and 12B can emit light for both the periphery and the upper and lower sides, and thus the LED assembly 400a can be regarded as a light-emitting element that can provide six-sided illumination. Fig. 12C shows another LED assembly 400b, wherein the lower surface 104 is coated with a phosphor layer 131 having a phosphor powder therein to convert the light emitted by the blue LED wafer 108 into another color. Light. As such, the chance of leaking blue light from the lower surface 104 can be reduced. In another embodiment, the blue LED chips 108 in the LED assembly 400a can be replaced with white LED wafers, each of which is essentially a blue LED wafer having a phosphor layer formed on its surface. In this way, the problem of blue light leakage can be avoided.

Although the LED assemblies 100a and 100b of the previous embodiment have vias 107, as part of a line, the conductive electrode plates 120 and 118 on the upper and lower surfaces 102 and 104 of the transparent substrate 106 can serve as the second of the LED assemblies 100a and 100b. The power input is driven, but the invention is not limited to having a via.

Figure 13 shows a perspective view of an LED assembly 200 in accordance with an embodiment of the present invention. Figures 14 and 15 are a top view and a side view, respectively, of LED assembly 200a. Unlike the LED assemblies 100a and 100b, the LED assemblies 200a of FIGS. 14 and 15 are formed with conductive electrodes 118 and 119 at the two terminals 114 and 116 of the upper surface 102 of the transparent substrate 106, respectively. In the LED assembly 200a, the conductive electrode plates 118 and 119 partially extend or extend beyond the two terminals 114, 116 of the transparent substrate 106. Moreover, the LED assembly 200a does not have a via 107. The manufacturing method and steps of the LED module 200 or 200a in the figures 13, 14 and 15 can be inferred by referring to the foregoing description, and therefore will not be described again.

In the LED assembly 200a, there is a single corresponding transparent adhesive layer 132 under each of the blue LED chips 108, but the invention is not limited thereto. As previously described, in other embodiments, a plurality of blue LED chips 108 may share a transparent adhesive layer 132, or all of the blue LED wafers 108 may be adhered to the transparent substrate 106 only through a transparent adhesive layer 132.

Figures 16 and 17 show another LED assembly 200b similar to the LED assembly 200a of Figures 14 and 15, but each of the blue LED wafers 108 of Figures 16 and 17 is affixed to a primary substrate. The upper substrate 160 is fixed to the transparent substrate 106 through the transparent adhesive layer 132. The details in the LED assembly 200b can be inferred with reference to the LED assembly 100b in FIG. 8A and FIG. 8B and the related description, and will not be described again.

Figure 18 shows a side view of another LED assembly 200c. Fig. 19 shows a process method of the LED assembly 200c. Fig. 18 is similar to Fig. 17, and the top view of Fig. 18 can be similar to Fig. 16, and Fig. 19 is similar to Fig. 9, and the same points are not described again. Different from Fig. 17, in Fig. 18, the conductive electrode plates 118 and 119 are attached to the transparent adhesive layer 132. In the process of FIG. 19, a step 151 is inserted between steps 150 and 152, which coats the transparent adhesive layer 132 on the transparent substrate 106. In other words, the formation of the transparent adhesive layer 132 can be performed before the conductive electrode plates 118 and 119 are attached. The transparent adhesive layer 132 may be an epoxy resin or a silicone, and is mixed with the same or similar fluorescent powder as in the transparent colloid 112. For example, the phosphor powder can be YAG or TAG phosphor.

The LED components 200b and 200c in FIGS. 17 and 18 are fixed to the transparent substrate 106 by a single transparent adhesive layer 132. However, the invention is not limited to this. In other embodiments, the LED assemblies 200b and 200c can be modified to adhere the secondary substrate 160 to the transparent substrate 106 using the two layers of transparent adhesive layers 132 and 133 of FIGS. 8C and 8D. In another embodiment, another transparent adhesive layer 133 may be formed between the sub-substrate 160 and the transparent adhesive layer 132 to increase the adhesion between each other.

The lower surface 104 of the LED assemblies 200a, 200b, and 200c is completely unpatterned, with no problem of scratching the lower surface 104. The LED components 200a, 200b and 200c can be applied to the application of a full-circumference light field, and have no blue light leakage problem. For example, a bulb may be soldered or a conductive fixture to secure the LED assembly 200a, 200b or 200c, the conductive electrode plates 118 and 119 at the two terminals 114 and 116, and simultaneously provide driving power through the two electrode plates. Electrical connection.

Figure 20 shows a perspective view of an LED assembly 300 in accordance with another embodiment of the present invention. 21A and 21B show top and bottom views of an LED assembly 300a. Figure 22 shows a cross-sectional view of the LED assembly 300a. The LED assembly 300a is formed with conductive electrodes 120 and 122 at the two terminals 114 and 116 of the lower surface 104 of the transparent substrate 106, respectively. In the 21A, 21B, and 22 drawings, the LED assembly 300a has two via holes 107A, 107B formed at positions close to the terminals 114, 116, respectively. The conductive electrode plate 120 passes through the via hole 107A, and the conductive electrode plate 122 passes through the via hole 107B and is electrically connected to the blue LED chip 108 located on the upper surface 102. The blue LED chip 108 is disposed and electrically connected between the via holes 107A and 107B, and is also disposed and electrically connected between the conductive electrode plates 120 and 122. The details and possible variations in the LED assembly 300a can be inferred from the description of other embodiments in this specification and will not be described again.

Figure 23 shows a side view of the LED assembly 300b. The sub-substrate 160 is sandwiched between the blue LED chip 108 and the transparent adhesive layer 132. The details and possible variations in the LED assembly 300b can be inferred from the description of other embodiments in this specification and will not be described again.

Although in the LED assemblies 200 and 300, the conductive electrode plates at the two terminals partially extend or extend beyond the two terminals 114, 116 of the transparent substrate 106, the present invention is not limited thereto. Figure 24 shows a perspective view of LED assembly 600. Figure 25A shows LED assembly 600a, which is a possible top view of LED assembly 600. In Fig. 25A, the conductive electrode plates 118 and 119 have one side aligned with the edge of the transparent substrate 106. Figure 25B shows LED assembly 600b, which is another possible top view of LED assembly 600. In Fig. 25B, the conductive electrode plates 118 and 119 are completely seated within the transparent substrate 106.

Fig. 26A shows an LED bulb 500a with LED assembly 300 as a lamp core. The LED bulb 500a has two clamps 502. The clamp 502 can be V-shaped or Y-shaped. In an embodiment, the clamp 502 can be rectangular and have a recess for securing the LED assembly 300. Each of the clamps 502 is formed of a conductive material. The two ends of the clamp 502 are used to clamp the conductive electrode plates of the two terminals of the LED assembly 300, and the upper surface 102 of the LED assembly 300 faces upward (the direction of Z). The clamp 502 also electrically connects the conductive electrode plates at both ends of the LED assembly 300 to the Edison socket of the LED bulb 500a to provide the electrical energy required for the LED assembly 300 to illuminate. Figure 26B is similar to Figure 26A, but with LED assembly 600 as a light bulb LED bulb 500b. Unlike the LED bulb 500a, the upper surface 102 of the LED assembly 600 in the LED bulb 500b faces the direction of Y, substantially perpendicular to the axis of rotation (Z direction) of the LED bulb 500b. Of course, the LED assembly 300 or 600 in FIGS. 26A and 26B can be replaced with the LED assembly 200 previously described. The details and possible variations can be inferred by referring to the description of other embodiments in this specification. Repeated.

The lower surface 104 of the LED assemblies 300a and 300b has only a large area, and is less likely to be scratched by the conductive electrode plates 120 and 122, and the process yield can be considerably improved. The lower surface 104 of the LED assemblies 600a and 600b is completely unpatterned and less fearful of scratches. The LED components 300a, 300b, 600a and 600b can be applied to the application of the full-period light field with less blue light leakage.

Although the above embodiments employ the blue LED chip 108 as a light source, the invention is not limited thereto. In other embodiments, some or all of the LED chips are not blue light, but red or green.

Some embodiments of the present invention can be applied to all-circumference applications because of the presence of the transparent substrate 106 and the transparent adhesive layer 132, which can be illuminated in all directions. In some embodiments, all of the blue LED wafers 108 are substantially wrapped by the transparent adhesive layer 132 and the transparent colloid 112, so there is no blue light leakage problem. The LED assembly of some embodiments can simultaneously receive power supply and mechanism support as long as a terminal is fixed; in some embodiments, the LED assembly can receive power from both terminals while mechanically fixing the two terminals; in some embodiments The lower surface of the LED component has no detailed pattern or circuit, and is not afraid of scratching, and can be easily taken or fixed during the manufacturing process to improve the process yield.

The above description is only a few embodiments of the present invention, but the embodiments can be referred to, merged or replaced with each other without conflicting with each other, and all the equivalent changes and modifications according to the scope of the present invention should belong to The scope of the invention.

100, 100a, 100b, 100c‧‧‧ LED components
102‧‧‧ upper surface
104‧‧‧lower surface
106‧‧‧Transparent substrate
107, 107A, 107B‧‧‧through holes
108, 108a, 108b‧‧‧Blue LED chip
110‧‧‧welding line
112‧‧‧Transparent colloid
114, 116‧‧‧ Terminal
118‧‧‧Electrical electrode plate
119‧‧‧conductive electrode plate
120‧‧‧conductive electrode plate
122‧‧‧conductive electrode plate
130‧‧‧Vertical conduction components
131‧‧‧Fluorescent layer
132, 133‧‧ ‧ transparent adhesive layer
148, 150, 151, 152, 154, 154a, 155, 155a, 156, 157, 158 ‧ ‧ steps
160‧‧‧substrates
180‧‧‧shade
182‧‧‧heating mechanism
183‧‧‧Electrical connection mechanism
190‧‧‧ Solder
192‧‧‧ boards
194‧‧‧Metal clips
200, 200a, 200b, 200c‧‧‧ LED components
300, 300a, 300b‧‧‧ LED components
400, 400a, 400b‧‧‧ LED components
402‧‧‧ Conductive strip
500a, 500b ‧‧‧LED bulbs
502‧‧‧ fixture
600, 600a, 600b‧‧‧ LED components

1 is a perspective view of an LED assembly in accordance with an embodiment of the present invention. Figure 2A shows a top view of LED assembly 100a. Figure 2B shows a bottom view of the LED assembly 100a. Figures 3A and 3B show a schematic cross-sectional view of AA and BB in Figure 2A, respectively. Figure 4 shows the LED assembly 100 disposed in a light bulb. Figure 5A shows the LED assembly 100 secured with solder. Figure 5B shows the LED assembly 100 secured with metal clips. Figure 6 shows a process for forming the LED components of Figures 3A and 3B. 7A and 7B show top and bottom views, respectively, of the LED assembly 100b. Figures 8A and 8B show a schematic cross-sectional view of AA and BB in Figure 7A. 8C and 8D are cross-sectional views showing the LED assembly 100c. Fig. 9 shows a manufacturing method of the LED assembly 100b. FIG. 10 is a perspective view of a light emitting diode assembly 400 in accordance with an embodiment of the present invention. 11A and 11B show top and bottom views of the LED assembly 400a. 12A and 12B are schematic cross-sectional views showing AA and BB of the LED assembly 400a in Fig. 11A, respectively. Figure 12C shows another LED assembly 400b. FIG. 13 shows a perspective view of the LED assembly 200. Figures 14 and 15 are a top view and a side view, respectively, of LED assembly 200a. Figures 16 and 17 show another LED assembly 200b. Figure 18 shows another LED assembly 200c. Fig. 19 shows a process method of the LED assembly 200c. Figure 20 shows a perspective view of an LED assembly 300 in accordance with another embodiment of the present invention. 21A and 21B show top and bottom views of an LED assembly 300a. Figure 22 shows a cross-sectional view of the LED assembly 300a. Figure 23 shows a side view of the LED assembly 300b. Figure 24 shows a perspective view of LED assembly 600. 25A and 25B show top views of LED assemblies 600a and 600b. Figures 26A and 26B show two LED bulbs with LED assemblies 300 and 600 as light cores, respectively.

100a‧‧‧LED components

102‧‧‧ upper surface

104‧‧‧lower surface

106‧‧‧Transparent substrate

107‧‧‧through holes

108, 108b‧‧‧Blue LED chip

110‧‧‧welding line

112‧‧‧Transparent colloid

114, 116‧‧‧ Terminal

118‧‧‧Electrical electrode plate

120‧‧‧conductive electrode plate

130‧‧‧Vertical conduction components

132‧‧‧Transparent adhesive layer

Claims (10)

A light emitting diode assembly comprising: a substrate having a first surface and a second surface opposite to the first surface; a light emitting diode wafer on the first surface; a first electrode formed On the first surface; and a second electrode formed on the second surface and electrically connected to the first electrode; wherein, in a cross section, the first electrode and the second electrode have different lengths . The light-emitting diode assembly of claim 1, wherein no light-emitting diode chip is disposed on the second surface. The illuminating diode assembly of claim 1, further comprising a transparent colloid covering the illuminating diode chip and a portion of the first electrode. The light emitting diode assembly of claim 1, further comprising a bonding layer between the substrate and the light emitting diode chip. The light emitting diode assembly of claim 1, wherein the light emitting diode chip comprises a plurality of light emitting diodes connected to each other in series. The light-emitting diode assembly of claim 1, wherein the light-emitting diode chip and the first electrode are electrically connected by a bonding wire. The light emitting diode assembly of claim 1, further comprising a conductive strip between the substrate and the light emitting diode chip. The illuminating diode assembly of claim 7, wherein the first electrode is located on the conductive strip. The light-emitting diode assembly of claim 1, wherein the substrate is elongated and has a terminal, and the first electrode is disposed at the terminal. A light bulb comprising a lamp cover; a light emitting diode assembly according to claim 1 of the invention, disposed in the lamp cover; and an electrical connection mechanism connected to the lamp cover.