CN216773275U

CN216773275U - LED packaging structure and light source

Info

Publication number: CN216773275U
Application number: CN202120843816.6U
Authority: CN
Inventors: 宋文洲
Original assignee: Shenzhen Guang Tai Industrial Co ltd
Current assignee: Shenzhen Guang Tai Industrial Co ltd
Priority date: 2021-04-22
Filing date: 2021-04-22
Publication date: 2022-06-17
Anticipated expiration: 2031-04-22

Abstract

The utility model discloses an LED packaging structure and a light source, the LED packaging structure comprises a first surface and at least one side surface adjacent to the first surface, the LED packaging structure also comprises: the first welding surface is arranged on the first surface; and the second welding surface is electrically connected with the first welding surface, and the second welding is arranged on the side surface. The tin-soldering effect of the LED packaging structure can be improved, and the problem of insufficient packaging welding strength caused by small size and small tin-soldering area of the packaging structure can be reduced.

Description

LED packaging structure and light source

Technical Field

The utility model relates to an LED packaging technology, in particular to an LED packaging structure and a light source.

Background

The LED is a new lighting source in the 21 st century, has the advantages of high lighting effect, less heat productivity, low working voltage, low power consumption, small volume and the like, can be packaged in a plane, is easy to develop light and thin products, and has firm structure, long service life and the like. The LED light source does not contain harmful substances such as mercury, lead and the like, has no infrared and ultraviolet ray pollution, and does not pollute the environment in production and use. Therefore, from the viewpoint of saving electric energy, reducing greenhouse gas emission, and reducing environmental pollution, it is a great trend to develop LEDs as new lighting sources to replace traditional lighting fixtures.

At present, along with the trend that LEDs are being miniaturized, the weldable area of the LED packaging structure is small, and then the LED packaging structure is easy to be subjected to cold welding and even easily falls off after welding.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the utility model provides the LED packaging structure, which can improve the tin-soldering effect of the LED packaging structure and can reduce the problem of insufficient packaging and welding strength caused by small size and small tin-soldering area of the packaging structure.

In a first aspect, an embodiment of the present invention provides an LED package structure, including a first surface and at least one side surface adjacent to the first surface, the LED package structure further including:

the first welding surface is arranged on the first surface;

the second welding surface is electrically connected with the first welding surface, and the second welding surface is arranged on the side surface.

As an optional implementation, the LED package structure further includes: a substrate and an LED wafer;

the substrate comprises a first circuit layer, an insulating layer and a second circuit layer, wherein the insulating layer is arranged on the first surface, the second surface is arranged on the insulating layer, the first surface is provided with the first circuit layer, and the second surface is provided with the second circuit layer;

the LED wafer is arranged on the second circuit layer and is electrically connected with the second circuit layer;

the substrate further comprises a first groove body, and a conductive material is filled in the first groove body; the conductive material is exposed out of the first surface to form the first welding surface, or the conductive material is exposed out of the first surface and electrically connected with the first welding surface; the conductive material is exposed out of the side face to form the second welding face, or the conductive material is exposed out of the side face and electrically connected with the second welding face.

As an optional implementation, the LED package structure further includes:

a 2N-1 welding surface, wherein the 2N-1 welding surface is arranged on the first surface;

a 2N-th welding surface, the 2N-th welding surface being disposed on the side surface;

n is a positive integer greater than or equal to 2.

As an optional embodiment, the substrate further comprises:

the first groove body is filled with a conductive material; the conductive material is exposed out of the first surface to form the 2N-1 welding surface, or the conductive material is exposed out of the first surface and electrically connected with the 2N-1 welding surface; the conductive material is exposed out of the side face to form the 2N welding face, or the conductive material is exposed out of the side face and electrically connected with the 2N welding face.

As an alternative embodiment, the conductive material comprises one or more of copper, silver, gold, palladium, tin.

As an optional implementation manner, the method further includes:

and the colloid covers the LED wafer.

As an alternative embodiment, the first circuit layer is provided with a first circuit, and the second circuit layer is provided with a second circuit; the conductive material connects the first circuit and the second circuit.

In a third aspect, an embodiment of the present invention provides an LED light source, which includes at least one LED package structure as described in the first aspect.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of an LED package structure according to an embodiment of the utility model;

fig. 2 is a schematic view of an LED package structure according to another embodiment of the present invention;

fig. 3 is a schematic view of an LED package structure according to another embodiment of the utility model;

fig. 4 is a schematic view of an LED package structure according to another embodiment of the present invention;

fig. 5 is a schematic view of an LED package structure according to another embodiment of the utility model;

fig. 6 is a schematic view of an LED package structure according to another embodiment of the present invention;

fig. 7 is a schematic view of an LED package structure according to another embodiment of the utility model;

fig. 8 is a schematic view of an LED package structure according to another embodiment of the present invention;

fig. 9 is a schematic view of an LED package structure according to another embodiment of the utility model;

fig. 10 is a schematic view of an LED package structure according to another embodiment of the utility model;

fig. 11 is a schematic view of an LED package structure according to another embodiment of the present invention;

fig. 12 is a schematic view of an LED package structure according to another embodiment of the present invention;

fig. 13 is a schematic view of an LED package structure according to another embodiment of the utility model;

fig. 14 is a schematic view of an LED package structure according to another embodiment of the utility model;

fig. 15 is a schematic view of an LED package structure according to another embodiment of the utility model;

fig. 16 is a schematic view of an LED package structure according to another embodiment of the utility model;

fig. 17 is a schematic view of an LED package structure according to another embodiment of the present invention;

fig. 18 is a schematic view of an LED package structure according to another embodiment of the present invention;

fig. 19 is a flowchart illustrating a manufacturing method corresponding to an LED package structure according to an embodiment of the utility model;

fig. 20 is a flowchart illustrating a manufacturing method of an LED package structure according to another embodiment of the utility model.

Reference numerals are as follows:

a substrate 1100; a second surface 1110; an insulating layer 1120; a first surface 1130; an LED wafer 1200; a tank body 1300; a guide hole 1301; a conductive material 1310; a second circuit layer 1320; a bottom wall 1311; sidewalls 1312; and a colloid 1400.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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 thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If there is a description of first and second for the purpose of distinguishing technical features only, this is not to be understood as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1, fig. 1 is a schematic view of an LED package structure according to an embodiment of the present invention, and the LED package structure shown in fig. 1 at least includes the following components: substrate 1100, LED wafer 1200, cell body 1300, colloid 1400. Fig. 1 shows a perspective view of an LED package structure, a groove 1300 is disposed inside a substrate 1100, an LED chip 1200 is disposed above the substrate 1100, a glue 1400 is further disposed above the substrate 1100, the glue 1400 is made of a transparent material or a fluorescent glue and is used for protecting a circuit above the substrate 1100, and the LED chip 1200.

In some embodiments, an LED package structure, comprising: the substrate 1100 and the LED chip 1200, the substrate includes a second surface 1110, an insulating layer 1120 and a first surface 1130, the insulating layer 1120 is disposed on the first surface 1130, the second surface 1110 is disposed on the insulating layer 1120, the second surface 1110 is provided with a second circuit layer, and the first surface 1130 is provided with a first circuit layer; the LED chip 1200 is disposed on the second surface 1110; the substrate 1100 further comprises a first groove body and a second groove body, wherein two ends of the first groove body are respectively connected with the second surface 1110 and the first surface 1130, and two ends of the second groove body are respectively connected with the second surface 1110 and the first surface 1130; the first tank is filled with a conductive material 1310, and one side wall 1312 (the portion of the tank where the conductive material is exposed on the side) and one bottom wall 1311 (the portion of the tank where the conductive material is exposed on the first surface) of the first tank include a tin-plated structure (a soldered surface); the second tank is filled with a conductive material 1310, and one side wall 1312 and one bottom wall 1311 of the second tank comprise a tin-plated structure.

The LED package structure according to the embodiment of the first aspect of the present invention includes a first surface 1130 and at least one side surface adjacent to the first surface, and further includes: a first bonding surface disposed on the first surface 1130; the second welding surface is electrically connected with the first welding surface and arranged on the side surface.

In some embodiments, the sides may be adjacent sides or may be opposite sides.

In some embodiments, the method comprises: a first bonding side comprising a first bonding layer; the second welding surface is connected with the first welding surface and comprises a second welding layer.

In some embodiments, the LED package structure further comprises: a substrate 1100 and an LED wafer; the substrate 1100 includes a second surface 1110, an insulating layer 1120, a first surface 1130, and four side surfaces, the insulating layer 1120 is disposed on the first surface 1130, the second surface 1110 is disposed on the insulating layer 1120, the four side surfaces are all adjacent to the first surface 1130, the second surface 1110 is disposed with a second circuit layer, and the first surface 1130 is disposed with a first circuit layer; the LED chip is disposed on the second surface 1110; the substrate 1100 further comprises a first tank body and a second tank body, wherein the first tank body is filled with a conductive material; the conductive material is exposed out of the first surface to form a first welding surface (for example, the conductive material is exposed out of the first surface to directly form the first welding surface, or the conductive material is exposed out of the first surface and forms the first welding surface with the first circuit layer); the exposed side surface of the conductive material forms a second welding surface, or the conductive material is exposed on the side surface and is electrically connected with the second welding surface (for example, the second welding surface can be electroplated on the side surface to be electrically connected with the conductive material); the second groove body is filled with a conductive material; the conductive material is exposed out of the first surface to form a third welding surface (for example, the conductive material is exposed out of the first surface to directly form the third welding surface, or the conductive material is exposed out of the first surface and forms the third welding surface with the first circuit layer); the exposed side surface of the conductive material forms a fourth welding surface, or the exposed side surface of the conductive material is electrically connected with the fourth welding surface. The side surfaces may be the same side surfaces or different side surfaces.

In some embodiments, the first and second channels may be through the substrate 1100, or through the first surface 1130 and the insulating layer 1120. By applying the groove body of the non-through substrate 1100, the non-through surface does not need to be cut, ground and other processes when the LED packaging structure is processed, and the production efficiency is improved. The groove may be formed by cutting a guide hole (e.g., a through hole or a blind hole) of the substrate, and reference may be made to the following description.

In some embodiments, the LED package structure further comprises: a 2N-1 th bonding surface, the 2N-1 th bonding surface being disposed on the first surface 1130; the 2N welding surface is arranged on the side surface; n is a positive integer greater than or equal to 2.

In some embodiments, the substrate 1100 further comprises: the Nth groove body is filled with a conductive material; the conductive material is exposed on the first surface to form a 2N-1 welding surface (for example, the conductive material is exposed on the first surface to directly form the 2N-1 welding surface, or the conductive material is exposed on the first surface and forms the 2N-1 welding surface with the first circuit layer); the exposed side surface of the conductive material forms a 2N welding surface, or the exposed side surface of the conductive material is electrically connected with the 2N welding surface.

In some embodiments, as shown in fig. 1, the number of the grooves is 2, and the number of the grooves may also be 3, 4, 5, 6, etc. for adapting to different LED chips.

Referring to fig. 2, fig. 2 is a schematic view of an LED package structure according to another embodiment of the present invention, and the LED package structure shown in fig. 2 at least includes the following parts: the substrate 1100, the side walls 1312 (the portions of the tank where the conductive material is exposed on the sides) and the bottom wall 1311 (the portions of the tank where the conductive material is exposed at the first surface 1130) of the tank 1300. As shown in fig. 2, both the side wall 1312 and the bottom wall 1311 of the groove 1300 in the LED package structure are formed by filling the groove 1300 with the conductive material 1310, so that both the side wall 1312 and the bottom wall 1311 can be tinned, the tinned area of the LED package structure is increased, and the stability of the LED package structure in use can be improved, for example, when the length of the LED package structure is less than or equal to 0.65mm, the width of the LED package structure is less than or equal to 0.35mm, and the height of the LED package structure is less than or equal to 0.25mm, the LED package structure provided by the embodiment of the present invention can reduce the problem of insufficient package soldering strength caused by small size and small tinned area of the package structure.

In some embodiments, the substrate 1100 further comprises: the two ends of the third tank body are respectively connected with the first surface and the second surface, and the two ends of the fourth tank body are respectively connected with the first surface and the second surface; the third tank is filled with a conductive material 1310, one side wall 1312 and one bottom wall 1311 of the third tank comprise tin-plated structures; the fourth tank is filled with a conductive material 1310, and one side wall 1312 and one bottom wall 1311 of the fourth tank comprise a tin-plated structure.

In some embodiments, the substrate 1100 further comprises: the two ends of the third tank body are respectively connected with the first surface and the second surface, and the two ends of the fourth tank body are respectively connected with the first surface and the second surface; the third groove body is filled with conductive materials, one side wall of the third groove body is connected with the fifth welding surface, and the other bottom wall of the third groove body is connected with the sixth welding surface; the fourth groove body is filled with conductive materials, one side wall of the fourth groove body is connected with the seventh welding face, and the other bottom wall of the fourth groove body is connected with the eighth welding face.

Referring to fig. 3, fig. 3 is a schematic view of an LED package structure according to another embodiment of the present invention, and the LED package structure shown in fig. 3 at least includes the following parts: a second surface 1110, an insulating layer 1120, and a first surface 1130. The second surface 1110, the insulating layer 1120 and the first surface 1130 are sequentially disposed, the second surface 1110 is provided with a second conductive layer, and the first surface 1130 is provided with a first conductive layer. The first conductive layer may be processed to form a first circuit layer and the second conductive layer may be processed to form a second circuit layer.

Referring to fig. 4, fig. 4 is a schematic view of an LED package structure according to another embodiment of the present invention, and the LED package structure shown in fig. 4 at least includes the following parts: a guide hole 1301. As shown in fig. 4, a via hole 1301 is opened in a substrate 1100. The via 1301 may be a through hole, and the via 1301 needs to penetrate through the substrate 1100, so that the conductive material is exposed out of the first surface 1130 and the second surface 1110 of the substrate 1100; the via 1301 can also be a blind via, and the via 1301 needs to penetrate the insulating layer 1120 and the first surface 1130 so that the conductive material is exposed out of the first surface 1130 of the substrate 1100.

Referring to fig. 5, fig. 5 is a schematic view of an LED package structure according to another embodiment of the present invention, and the LED package structure shown in fig. 5 at least includes the following parts: a conductive material 1310. As shown in fig. 5, the via 1301 is filled with a conductive material 1310. The conductive material 1310 includes one or more of copper, silver, gold, palladium, tin. The conductive material 1310 may be tin-plated.

Referring to fig. 6 and 7, fig. 6 and 7 are schematic diagrams of an LED package structure according to another embodiment of the present invention, respectively, and the LED package structure shown in fig. 6 and 7 at least includes the following parts: an LED chip 1200. As shown in fig. 6 and 7, the LED chip 1200 is fixed over the second circuit layer 1320.

Referring to fig. 8, fig. 8 is a schematic view of an LED package structure according to another embodiment of the present invention, and the LED package structure shown in fig. 8 at least includes the following parts: and a colloid 1400. As shown in fig. 8, a gel 1400 is applied over a substrate 1100. After the colloid 1400 is solidified, the protection effect on the LED packaging structure can be realized.

Referring to fig. 9 and 10, fig. 9 and 10 are schematic views of an LED package structure according to another embodiment of the present invention, and as shown in fig. 9 and 10, the LED package structure is cut to obtain the LED package structure shown in fig. 1 and 2. For example, a via 1301 may be cut through to form a side of the LED package structure, while leaving the conductive material exposed at the side to form a second bonding surface. Note that the guide hole 1301 is cut to form the groove 1300.

In some embodiments, the LED package structure has a length of 0.65mm or less, a width of 0.35mm or less, and a height of 0.25mm or less.

In some embodiments, the conductive material 1310 includes one or more of copper, silver, gold, palladium, tin.

In some embodiments, further comprising: and the colloid 1400, wherein the colloid 1400 is laid on the LED chip 1200.

In some embodiments, the first circuit layer is provided with a first circuit and the second circuit layer 1320 is provided with a second circuit.

In some embodiments, the conductive material 1310 connects the first circuit and the second circuit.

According to a second aspect of the utility model, an LED module comprises at least two LED package structures as in the first aspect.

In some embodiments, fig. 11 to 18 are schematic diagrams of an LED package structure according to another embodiment of the present invention, and as shown in fig. 11 to 18, the two-dimensional images correspond to the LED package structures shown in fig. 3 to 10, which are not repeated herein.

The LED package structure according to the embodiment of the present invention can be manufactured by the following method, as shown in fig. 19, at least including the following steps: s100: drilling a substrate to obtain a guide hole; s200: filling a conductive material in the guide hole; s300: processing the conductive layer on the substrate to form a second circuit layer; s400: fixing the LED wafer on the second circuit layer; s500: and cutting the substrate to obtain the LED packaging structure of the first aspect.

S100: the substrate is drilled to obtain a plurality of vias.

In some embodiments, the substrate is drilled to obtain the vias. The vias may be of any shape for conducting electrical circuits on the upper and lower surfaces of the substrate. For example, as shown in fig. 4, a plurality of rectangular vias may be drilled through the substrate to form a via array. The guide hole can be a through hole or a blind hole.

S200: filling a conductive material in the guide hole, wherein the conductive material can expose the first surface and the second surface of the substrate; the first surface of the substrate may be exposed but the second surface is not exposed. The conductive material is exposed out of the first surface of the substrate and forms a first welding surface with the first circuit layer.

In some embodiments, the vias are filled with a conductive material, and conductive layers are formed on the upper and lower surfaces of the substrate. The conductive material is typically one or more of copper, silver, gold, palladium, tin. The filled conductive material may be slightly higher than the substrate for subsequent processing.

S300: the conductive layer on the substrate is processed to form a second circuit layer.

In some embodiments, the conductive layer on the substrate is processed to form a second circuit layer. The processing can be realized by exposure, development, etching, electroplating and the like. In some embodiments, a second circuit layer is processed on the upper surface (second surface) of the substrate; a first circuit layer is formed on the lower surface (first surface) of the substrate. In some embodiments, referring to fig. 3, the second surface 1110 of the substrate is provided with a second conductive layer and the first surface 1130 is provided with a first conductive layer. The first conductive layer may be processed to form a first circuit layer and the second conductive layer may be processed to form a second circuit layer.

S400: and fixing the LED wafer on the second circuit layer.

In some embodiments, an LED die is secured to the second circuit layer. The fixing means includes, but is not limited to, welding and the like. And welding two contacts of the LED wafer on the second circuit layer to realize the connection of the LED wafer and the second circuit layer. In some embodiments, the second circuit layer is disposed on the upper surface (second surface) of the substrate.

S500: and cutting the substrate to obtain the LED packaging structure of the first aspect.

In some embodiments, the substrate is cut to obtain the LED package structure as embodied by the first aspect. The cutting method includes, but is not limited to, cutting with a cutter and laser cutting. The cutting sequence may be selected as needed, and the present application does not limit the cutting sequence. In cutting, it is necessary to penetrate a conductive material to form a cut surface.

In some embodiments, after the fixing the LED chip 1200 on the second circuit layer, further includes: and covering the LED wafer with transparent or semitransparent colloid or fluorescent colloid. In some embodiments, an encapsulant may be disposed over the substrate such that the encapsulant covers both the substrate and the LED chip.

That is, as shown in fig. 20, in some embodiments, the method for manufacturing the LED package structure may include at least the following steps:

s100: drilling a substrate to obtain a guide hole;

s200: filling a conductive material in the guide hole;

s300: processing the conductive layer on the substrate to form a second circuit layer;

s400: fixing the LED wafer on the second circuit layer;

s410: laying colloid above the substrate;

An LED light source according to an embodiment of the fourth aspect of the present invention comprises at least one LED package structure as in the first aspect, or; comprising at least one LED module according to the second aspect.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. An LED package structure comprising a first surface and at least one side adjacent to the first surface, the LED package structure further comprising:

the first welding surface is arranged on the first surface;

2. The LED package structure of claim 1, further comprising: a substrate and an LED wafer;

the substrate further comprises a first groove body, and a conductive material is filled in the first groove body; the conductive material is exposed out of the first surface to form the first welding surface, or the conductive material is exposed out of the first surface and electrically connected with the first welding surface; the conductive material is exposed out of the side face to form the second welding face, or the conductive material is exposed out of the side face and is electrically connected with the second welding face.

3. The LED package structure of claim 2, further comprising:

n is a positive integer greater than or equal to 2.

4. The LED package structure of claim 3, wherein the substrate further comprises:

the Nth groove body is filled with a conductive material; the conductive material is exposed out of the first surface to form the 2N-1 welding surface, or the conductive material is exposed out of the first surface and electrically connected with the 2N-1 welding surface; the conductive material is exposed out of the side face to form the 2N welding face, or the conductive material is exposed out of the side face and electrically connected with the 2N welding face.

5. The LED package structure according to any one of claims 2 to 4, wherein the conductive material is one of copper, silver, gold, palladium, and tin.

6. The LED package structure of claim 5, further comprising:

and the colloid covers the LED wafer.

7. The LED package structure of claim 6, wherein the first circuit layer is provided with a first circuit and the second circuit layer is provided with a second circuit; the conductive material connects the first circuit and the second circuit.

8. An LED light source comprising at least one LED package structure according to any one of claims 1 to 7.