High-luminous-efficiency COB light source device

Abstract

The utility model discloses a COB light source device with high luminous efficiency, which comprises a substrate, a box dam ring, a light-emitting module, a reflective colloid and a glue sealing piece, the box dam ring is arranged on the substrate and defines a placement area in a surrounding way, the light-emitting module is positioned in the placement area, the light-emitting module comprises a plurality of upright LED lamp wicks, the LED lamp wicks are arranged on the substrate, the reflective colloid is arranged on the substrate, and the reflective colloid is arranged on the substrate. The two LED lamp wicks are connected through a gold bonding wire, the reflective colloid is laid on the surface, in the containing area, of the substrate, the light-emitting portions of the LED lamp wicks are exposed out of the reflective colloid, the containing area is filled with the glue sealing piece, the glue sealing piece is connected with the substrate, and the condensation lighting effect can be further improved through the design.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor light source equipment, in particular to a high-light-efficiency COB light source device. Background Art

[0002] Existing COB light sources usually arrange LED wicks on a substrate with a conductive layer. The LED wicks are inverted to connect to the conductive layer. The LED wicks are arranged in a dam circle and then filled with sealant. The concentrated LED wicks emit light, and the light converges and emits, thus having a good lighting effect.

[0003] However, the conductive layer is usually a copper layer or a silver paste coating with low reflectivity. The conductive layer serves as a background layer within the dam circle, and the light irradiated on the conductive layer cannot be well reflected, so that the focusing light effect of the COB light source cannot be further improved. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a high-light-efficiency COB light source device to further improve the focusing light effect.

[0005] According to the first aspect of the utility model, a high-light-efficiency COB light source device includes: a substrate; a dam ring, which is arranged on the substrate and encloses and defines an installation area; a light-emitting module, which is located in the installation area, and the light-emitting module includes a plurality of upright LED wicks, the LED wicks are arranged on the substrate, and two of the LED wicks are connected by bonding gold wires; a reflective colloid, which is laid on the surface of the substrate in the installation area, and the light-emitting part of the LED wick is exposed from the reflective colloid; and a sealing member, which fills the installation area and is connected to the substrate.

[0006] A high light efficiency COB light source device according to an embodiment of the utility model has at least the following beneficial effects:

[0007] In the utility model high-light-efficiency COB light source device, the LED wick of the light-emitting module is arranged on the substrate in a normal manner, without the need for a conductive layer, and the LED wicks are connected by bonding gold wires, which have good reflective properties. In addition, a reflective adhesive layer is laid on the surface of the installation area of ​​the substrate, and the reflective adhesive layer can serve as the background within the dam circle and has good reflective properties. The light-emitting part of the LED wick is exposed to the reflective colloid and emits light, and part of the light is reflected on the reflective adhesive layer and can also be converged and emitted. This design can further improve the focusing light effect.

[0008] According to some embodiments of the present invention, the reflective colloid covers the surface of the bonding gold wire.

[0009] According to some embodiments of the utility model, the substrate is provided with a connection terminal group and a circuit layer outside the placement area, the connection terminal group is electrically connected to the circuit layer, the circuit layer partially extends into the placement area to form a wiring terminal, part of the LED wicks are directly electrically connected to the wiring terminal or are electrically connected to the wiring terminal through a bonding gold wire, and the reflective colloid covers the circuit layer and the wiring terminal located in the placement area.

[0010] According to some embodiments of the present invention, a plurality of the LED lamp cores are sequentially connected in series to form an LED lamp string, and the LED lamp cores at the ends of the LED lamp string are electrically connected to the wiring terminals.

[0011] According to some embodiments of the present invention, the circuit layer and the wiring terminals located in the placement area are both arranged on the inner edge of the dam circle.

[0012] According to some embodiments of the utility model, the circuit layer includes a transition section which is arc-shaped and extends along the dam circle, the connection terminal is also arc-shaped and extends along the inner edge of the dam circle, the dam circle covers the transition section, the transition section is electrically connected to the connection terminal group, one end of the transition section is connected to one end of the connection terminal, and the other end of the transition section is connected to the other end of the connection terminal.

[0013] According to some embodiments of the present invention, the substrate is an alumina ceramic substrate.

[0014] According to some embodiments of the utility model, the high-light-efficiency COB light source device further includes at least one constant current chip, which is disposed on the substrate and located in the placement area, the constant current chip is connected in series with the LED wick, and the reflective colloid covers the constant current chip.

[0015] According to some embodiments of the present invention, the constant current chip is arranged at the inner edge of the dam circle.

[0016] According to some embodiments of the present invention, the LED lamp core is connected to the constant current chip via a bonding gold wire.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1A top view of one embodiment of the light source device of the utility model;

[0020] Figure 2 A top view of the internal structure of one embodiment of the light source device of the utility model;

[0021] Figure 3 It is a cross-sectional view of one embodiment of the light source device of the present utility model.

[0022] Reference numerals:

[0023] Substrate 100; dam ring 110; light-emitting module 200; LED wick 210; reflective colloid 300; sealing component 400; bonding gold wire 500; connection terminal group 600; positive electrode pad 610; negative electrode pad 620; circuit layer 700; transfer section 710; terminal 720; constant current chip 800. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", etc., 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, and 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.

[0026] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected 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.

[0028] like Figure 1 - Figure 3 As shown, a high-light-efficiency COB light source device according to an embodiment of the first aspect of the utility model includes a substrate 100, a dam ring 110, a light-emitting module 200, a reflective colloid 300 and a sealing member 400. The dam ring 110 is arranged on the substrate 100 and encloses and defines a placement area. The light-emitting module 200 is located in the placement area. The light-emitting module 200 includes a plurality of upright LED wicks 210. The LED wicks 210 are arranged on the substrate 100. Two of the LED wicks 210 are connected by bonding gold wires 500. The reflective colloid 300 is laid on the surface of the substrate 100 in the placement area. The light-emitting part of the LED wick 210 is exposed from the reflective colloid 300. The sealing member 400 fills the placement area and is connected to the substrate 100.

[0029] Among them, in some embodiments of the present invention, the substrate 100 is an alumina ceramic substrate, and the substrate 100 can be square, rectangular or other shapes, and the reflectivity can reach more than 98%. However, the reflectivity of the traditional flip-chip metal substrate is only about 88% due to the coating of solder resist ink. Therefore, the use of a high-reflectivity alumina ceramic substrate 100 can improve the light efficiency.

[0030] Bonding gold wire 500 is a gold alloy wire used as a connecting wire in integrated circuits, also known as ball welding gold wire or lead gold wire, with a gold content of ≥99.99% and a total of trace elements <0.01%. Trace elements such as beryllium, copper, and silver have the functions of refining grains, increasing recrystallization temperature, and strengthening gold. It is vacuum melted in a high-frequency furnace, remelted twice, and crystallized directional. The ingot is cold-processed into a material after homogenization, so it has good reflective properties.

[0031] The reflective colloid 300 may be a highly reflective silicone, such as highly reflective white wall glue, etc. The sealing member 400 may be a fluorescent glue layer, which may be a transparent colloid or may be a colloid mixed with fluorescent powder.

[0032] Specifically, the highly reflective white wall glue is coated on the conductive layer of the substrate 100 by a spraying process. The reflectivity of the highly reflective white wall glue reaches 95%, which can effectively shield the conductive layer from absorbing light, thereby improving the light efficiency of the COB light source.

[0033] In the high-light-efficiency COB light source device of the utility model, the LED wick 210 of the light-emitting module 200 is arranged on the substrate 100 in a normal manner, and there is no need to arrange a conductive layer. The LED wicks 210 are connected by bonding gold wires 500, and the bonding gold wires 500 have good reflective properties. In addition, a reflective adhesive layer is laid on the surface of the installation area of ​​the substrate 100, and the reflective adhesive layer can serve as the background within the dam circle 110 and has good reflective properties. The light-emitting part of the LED wick 210 is exposed to the reflective colloid 300 and emits light. Part of the light is reflected on the reflective adhesive layer and can also be concentrated and emitted. This design can further improve the focusing light effect.

[0034] In some embodiments of the present invention, Figure 3 As shown, the reflective colloid 300 covers the surface of the bonding gold wire 500 .

[0035] The bonding gold wire 500 itself has a good reflectivity, and the reflective colloid 300 covers the bonding gold wire 500, so that the reflectivity of this position is well guaranteed, and light irradiated here can be reflected in large quantities and then converged and emitted.

[0036] In some embodiments of the utility model, the substrate 100 is provided with a connection terminal group 600 and a circuit layer 700 outside the placement area, the connection terminal group 600 is electrically connected to the circuit layer 700, the circuit layer 700 partially extends into the placement area to form a wiring terminal 720, part of the LED wicks 210 is directly electrically connected to the wiring terminal or is electrically connected to the wiring terminal through a bonding wire 500, and the reflective colloid 300 covers the circuit layer 700 and the wiring terminal 720 located in the placement area.

[0037] Among them, the connection terminal group 600 may include a positive electrode pad 610 and a negative electrode pad 620, and the positive electrode pad 610 and the negative electrode pad 620 can be connected to an external conductor. The circuit layer 700 here can be a copper layer or a silver glue coating, and the reflectivity is relatively low, but it can be well connected to the connection terminal group 600, and the circuit layer 700 can be partially extended into the placement area. The LED wick 210 can be directly electrically connected to the terminal, or electrically connected to the terminal through a bonding wire 500, and the reflective colloid 300 covers the circuit layer 700 and the terminal 720 in the placement area, thereby improving the reflectivity here. The existence of a small part of the circuit layer 700 and the terminal 720 will not cause a significant decrease in the reflectivity.

[0038] Specifically, a constant current driving power supply may be connected to the positive electrode pad 610 and the negative electrode pad 620 respectively to supply power to the LED wick 210 , thereby driving the LED wick 210 to light up.

[0039] When manufacturing the COB light source device, first set the dam circle 110 on the substrate 100, and install each LED wick 210 on the substrate 100 and locate it in the dam circle 110. Adjacent LED wicks 210 are connected by bonding gold wires 500, and some LED wicks 210 are connected to the circuit layer 700 by bonding gold wires. Then, a protective film is used to cover the light-emitting part of the LED wick 210, and highly reflective white wall glue is applied to the inside of the dam circle by spraying. After the spraying is completed, the protective film is removed.

[0040] In some embodiments of the present invention, Figure 2 As shown, a plurality of the LED lamp cores 210 are sequentially connected in series to form an LED lamp string, and the LED lamp cores 210 located at the ends of the LED lamp string are electrically connected to the wiring terminals.

[0041] Specifically, there can be multiple LED light strings. In the LED light string, two adjacent LED wicks 210 can be connected by a bonding gold wire 500, and the LED wicks 210 at the end of the LED light string are directly electrically connected to the terminal, or electrically connected to the terminal through a bonding gold wire 500.

[0042] In some embodiments of the present invention, Figure 1 , 2 As shown, the circuit layer 700 and the wiring terminal 720 located in the placement area are both arranged at the inner edge of the dam circle 110, and the light-emitting module 200 is located in the middle position, which is conducive to the convergence of light and reduces the influence of the circuit layer 700 and the wiring terminal 720 with lower reflectivity on the reflectivity inside the dam circle 110 to a lower level.

[0043] In some embodiments of the present invention, Figure 2 As shown, the circuit layer 700 includes a transition section 710 which is arc-shaped and extends along the dam circle 110, and the terminal 720 is also arc-shaped and extends along the inner edge of the dam circle 110. The dam circle 110 covers the transition section 710, and the transition section 710 is electrically connected to the connection terminal group 600. One end of the transition section 710 is connected to one end of the terminal 720, and the other end of the transition section 710 is connected to the other end of the terminal 720.

[0044] The terminal 720 is arc-shaped and extends along the inner edge of the dam circle 110. The LED wicks 210 at the ends of multiple LED light strings therein can be more easily connected to the terminal 720 without setting an overly long bonding wire 500. The LED wicks 210 also do not need to be too clustered in order to connect to the terminal 720, so that the light is more uniform.

[0045] At the same time, in order to make the connection end group 600 and the terminal 720 electrically connected, the transfer section 710 serves as an intermediate conductive medium, connected to the connection end group 600 and the terminal 720 respectively. At the same time, the transfer section 710 is arc-shaped and extends along the dam circle 110. The dam circle 110 covers the transfer section 710, so that the transfer section 710 can be masked without affecting the reflectivity inside the dam circle 110.

[0046] In some embodiments of the present invention, the high-efficiency COB light source device also includes at least one constant current chip 800, which is arranged on the substrate 100 and located in the placement area. The constant current chip 800 is connected in series with the LED wick 210, and the reflective colloid 300 covers the constant current chip 800.

[0047] The constant current chip 800 can be a constant current diode chip, which can limit the current flowing through the LED wick 210, thereby protecting the LED wick 210. Since the constant current chip 800 has a low reflectivity, the reflective colloid 300 covers the constant current chip 800, thereby reducing the impact on the reflectivity within the dam circle 110.

[0048] The constant current diode chip has an automatic constant current effect. When connected in series with the LED wick 210, the current of the COB light source can be kept constant within a relatively wide voltage range. The voltage of the constant voltage source can be matched by designing different numbers of LED wicks 210 in series. The current of the COB light source can be controlled by matching constant current diode chips with different current values ​​or by connecting different numbers of constant current diode chips in parallel.

[0049] In some embodiments of the utility model, the constant current chip 800 is arranged at the inner edge of the dam circle 110. Similarly, the light-emitting module 200 is located in the middle position, which is conducive to the convergence of light. At the same time, the constant current chip 800 with lower reflectivity is prevented from being close to the edge of the dam circle 110, which can reduce the influence of the reflectivity inside the dam circle 110 to a lower level.

[0050] In some embodiments of the present invention, the LED wick 210 is connected to the constant current chip 800 through a bonding gold wire 500. Specifically, the LED wick 210 located at the end of the LED light string can also be first connected to the constant current chip 800 through a bonding gold wire 500, and then the constant current chip 800 is electrically connected to the wiring terminal through the bonding gold wire 500.

[0051] This design has the characteristics of high brightness and high luminous efficiency, as well as constant voltage drive, stable operation, low voltage safety, and group control. It breaks through the limitations of the original COB light source's focusing effect and further optimizes the luminous effect.

[0052] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A high light efficiency COB light source device, characterized in that: include: substrate; A dam ring is arranged on the base plate and encloses and defines a placement area; A light-emitting module is located in the placement area, and the light-emitting module includes a plurality of upright LED lamp cores, the LED lamp cores are arranged on the substrate, and two of the LED lamp cores are connected by bonding gold wires; A reflective colloid is laid on the surface of the substrate in the placement area, and the light-emitting portion of the LED lamp core is exposed from the reflective colloid; A sealing member is filled in the placement area and connected to the substrate.

2. The high light efficiency COB light source device according to claim 1, characterized in that: The reflective colloid covers the surface of the bonding gold wire.

3. The high light efficiency COB light source device according to claim 1, characterized in that: The substrate is provided with a connection terminal group and a circuit layer outside the placement area, the connection terminal group is electrically connected to the circuit layer, the circuit layer partially extends into the placement area to form a wiring terminal, part of the LED wicks are directly electrically connected to the wiring terminal or are electrically connected to the wiring terminal through a bonding wire, and the reflective colloid covers the circuit layer and the wiring terminal located in the placement area.

4. The high light efficiency COB light source device according to claim 3, characterized in that: A plurality of the LED lamp cores are sequentially connected in series to form an LED lamp string, and the LED lamp cores at the ends of the LED lamp string are electrically connected to the wiring terminals.

5. The high light efficiency COB light source device according to claim 3, characterized in that: The circuit layer and the wiring terminals located in the placement area are both arranged on the inner edge of the dam circle.

6. The high light efficiency COB light source device according to claim 5, characterized in that: The circuit layer includes a transition section which is arc-shaped and extends along the dam circle, and the connection terminal is also arc-shaped and extends along the inner edge of the dam circle. The dam circle covers the transition section, and the transition section is electrically connected to the connection terminal group. One end of the transition section is connected to one end of the connection terminal, and the other end of the transition section is connected to the other end of the connection terminal.

7. The high light efficiency COB light source device according to claim 1, characterized in that: The substrate is an alumina ceramic substrate.

8. The high light efficiency COB light source device according to claim 1, characterized in that: It also includes at least one constant current chip, which is arranged on the substrate and located in the placement area. The constant current chip is connected in series with the LED lamp core, and the reflective colloid covers the constant current chip.

9. The high light efficiency COB light source device according to claim 8, characterized in that: The constant current chip is arranged on the inner edge of the dam circle.

10. The high light efficiency COB light source device according to claim 8, characterized in that: The LED lamp core is connected to the constant current chip through a bonding gold wire.

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