Embedded component structure and process thereof

The disclosure relates to an embedded component structure and process thereof.

With recent progress of electronic technologies, electronic products that are more user-friendly and with better performance are continuously developed. Further, these products are designed to satisfy requirements for lightness, slimness, shortness, and compactness. In order to reduce the area of the wiring board on which electronic components are disposed or other requirements, a wiring board having an embedded component may be disposed in these products. Currently in the wiring board having an embedded component is provided, the component is embedded during the fabricating process of the wiring board. However, when the component is embedded, the fabricating process of the wiring board may cause reducing the process yield.

The disclosure relates to an embedded component structure, used for increasing the process yield during the fabricating process.

The disclosure relates to a process of an embedded component structure, used for increasing the process yield during the fabricating process.

The disclosure provides an embedded component structure including a wiring board, a component, and an encapsulant. The wiring board includes a front side, a reverse side opposite to the front side, an opening and an interconnection layer. The opening passes through the wiring board and connects the front side and the reverse side of the wiring board. The interconnection layer is located on the front side of the wiring board and extends toward the opening. The component has an active surface, a back surface opposite to the active surface, and a working area located on the active surface. The active surface is bonded to the interconnection layer, the component is located in the opening, and the active surface and the front side of the wiring board face in a same direction. The encapsulant is filled inside the opening and covers the component, and exposes the working area.

The disclosure further provides a process of an embedded component structure including the following steps. A wiring board is provided, wherein electrical function of the wiring board is normal, the wiring board has a front side, a reverse side opposite to the front side, an opening and an interconnection layer, the opening penetrates the wiring board and connects the front side and the reverse side, and the interconnection layer is located on the front side and extends toward the opening. A component is bonded to the wiring board, wherein electrical function of the component is normal, the component has an active surface, a back surface opposite to the active surface, and a working area located on the active surface, the active surface is bonded to the interconnection layer, the component is located in the opening, and the active surface and the front side of the wiring board face in a same direction; and An encapsulant is filled into the opening, so as to cover the component and expose the working area.

In light of the above, in the disclosure, the component whose electrical function is normal is bonded to the wiring board whose electrical function is normal, the component is located at the opening of the wiring board, and an encapsulant is filled into the opening. As such, the process of the embedded component structure is completed. Thus, the process yield of the embedded component structure is increased.

To make the above features and advantages of the present invention more comprehensible, several embodiments accompanied with drawings are described in detail as follows.

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

FIG. 1A through FIG. 1D schematically illustrate the steps of a process for fabricating an embedded component structure according to one embodiment of the disclosure.

FIG. 2 is a schematic view of an embedded component structure according to another embodiment of the disclosure.

FIG. 3 is a schematic view of an embedded component structure according to still another embodiment of the disclosure.

FIG. 1A through FIG. 1D schematically illustrate the steps of a process for fabricating an embedded component structure according to one embodiment of the disclosure. First, as shown in FIG. 1A , a wiring board 110 with normal electrical function is provided. In the embodiment, the wiring board 110 may be installed on a supporting board 200 in advance, so as to provide a sufficient supporting strength in proceeding fabricating steps, but the disclosure is not limited thereto. In the embodiment, the wiring board 110 has a front side 110 a , a reverse side 110 b opposite to the front side 110 a , an opening 110 c and an interconnection layer 113 , wherein the opening 110 c penetrates the wiring board 110 and connects the front side 110 a and the reverse side 110 b , and the interconnection layer 113 is located on the front side 110 a and extends toward the opening 110 c . The wiring board 110 may include a plurality of patterned conductive layers 112 , a plurality of dielectric layers 114 , and a plurality of conductive vias 116 . The patterned conductive layers 112 and the dielectric layers 114 are alternately laminated. Each of the conductive vias 116 passes through at least one of the dielectric layers 114 , so that each of the conductive vias 116 connects at least two of the patterned conductive layers 112 . The patterned conductive layer 112 located on the front side 110 a of the wiring board 110 is viewed as the interconnection layer 113 of the wiring board 110 . The thickness of the interconnection layer 113 may be larger than the thickness of the other patterned conductive layers 112 , so as to provide a sufficient supporting strength.

In the embodiment, the wiring board 110 may be formed by the two following methods, but the disclosure is not limited to this. For example, after a plurality of patterned conductive layers 112 (except the interconnection layer 113 ), a plurality of dielectric layers 114 and a plurality of conductive vias 116 are formed, the interconnection layer 113 is attached to the bottom most dielectric layer 114 and connected to the corresponding conductive vias 116 . Or, for example, after the interconnection layer 113 , a plurality of patterned conductive layers 112 , a plurality of dielectric layers 114 and a plurality of conductive vias 116 are formed, by using mechanical drilling method, laser drilling method, or the like, a part of dielectric layer 114 and the interconnection layer 113 are removed, and the opening 110 c of the wiring board 110 is formed.

Next, as shown in FIG. 1B , a component 120 with normal electrical function is bonded to the wiring board 110 . The component 120 has an active surface 120 a , a back surface 120 b opposite to the active surface 120 a , and a working area 120 c located on the active surface 120 a . In the embodiment, the interconnection layer 113 of the wiring board 110 has a plurality of leads 113 a extending toward to the opening 110 c , and the component 120 has a plurality of bonding pads 124 located on the active surface 120 a . The bonding pads 124 are bonded to the leads 113 a through a plurality of conductive bumps 130 (e.g., gold bumps) respectively. Therefore, the active surface 120 a of the component 120 is bonded to the interconnection layer 113 of the wiring board 110 , the component 120 is located in the opening 110 c , and the active surface 120 a of the component 120 and the front side 110 a of the wiring board 110 face in a same direction. In the embodiment, the component 120 may be an active component, such as an optical sensor chip, an acoustic sensor chip, or the like, but the disclosure is not limited thereto. Further, the working area 120 c of the component 120 may be an optical sensing area and an acoustic sensing area. In detailed, if the working area 120 c of the component 120 is an optical sensing area, then one or more optical sensing units may be disposed in the working area 120 c , so as to detect light. If the working area 120 c of the component 120 is an acoustic sensing area, then one or more acoustic sensing units may be disposed in the working area 120 c , so as to detect sound.

Next, please refer to FIG. 1C . An encapsulant 140 is filled inside the opening 110 c and covers the component 120 , and exposes the working area 120 c of the component 120 . In the embodiment, in order to prevent that the encapsulant 140 flows into the working area 120 c of the active surface 120 a of the component 120 , a stop layer 300 may be disposed around the working area 120 c of the active surface 120 a (as shown in FIG. 1C ). The stop layer 300 may prevent the encapsulant 140 from flowing into the working area 120 c , so as to maintain the normal operation of the working area 120 c . In another embodiment which is not shown in the drawings, in order to prevent that the encapsulant 140 flows into the working area 120 c of the active surface 120 a of the component 120 , a stop layer 300 may be disposed on the working area 120 c to cover the working area 120 c of the active surface 120 a.

Then, as shown in FIG. 1D , the supporting board 200 and the stop layer 300 of FIG. 1C are removed, and the process of the embedded component structure 100 of the embodiment is completed. In another embodiment which is not shown in the drawings, the stop layer 300 may also be retained.

As shown in FIG. 1D , in the embodiment, the back surface 120 b of the component 120 is lower than the reverse side 110 b of the wiring board 110 , and a portion of the encapsulant 140 located on the back surface 120 b of the component 120 and the reverse side 110 b of the wiring board 110 are substantially flush with each other. The wiring board 110 has a first thickness H 1 , the component 120 has a second thickness H 2 , a portion of the encapsulant 140 located on the back surface 120 b of the component 120 has a third thickness H 3 , and the interconnection layer 113 has a fourth thickness H 4 . The sum of the second thickness H 2 , the third thickness H 3 and the fourth thickness H 4 is substantially equal to the first thickness H 1 .

FIG. 2 is a schematic view of an embedded component structure according to another embodiment of the disclosure. Referring to FIG. 2 , in the embodiment, the embedded component structure 100 a and the embedded component structure 100 mentioned above is substantially the same; therefore, the following description is only related to the structural difference therebetween. In the embodiment, the component 120 may be an inkjet chip, thus a plurality of inkjet units 122 may be disposed on the active surface 120 a of the component 120 , so that the working area 120 c of the component 120 is formed into an inkjet area. In detailed, the inkjet units 122 located on the active surface 120 a of the component 120 may eject ink so as to perform printing function.

FIG. 3 is a schematic view of an embedded component structure according to still another embodiment of the disclosure. Referring to FIG. 3 , in the embodiment, the embedded component structure 100 b and the embedded component structure 100 mentioned above is substantially the same so that the following description is only related to the structural difference therebetween. In the embodiment, a first dielectric layer 114 a and a second dielectric layer 114 b are disposed on two opposite sides of the interconnection layer 113 respectively, such that the interconnection layer 113 is located between the first dielectric layer 114 a and the second dielectric layer 114 b . In detailed, the second dielectric layer 114 b extends toward the opening 110 c to the bottom of the conductive bumps 130 , and the wiring board 110 may further include a plurality of conductive vias 115 which pass through the second dielectric layer 114 b , such that the conductive bumps 130 may connected to the leads 113 a of the interconnection layer 113 through the conductive vias 115 respectively.

In light of the foregoing, in the disclosure, the component whose electrical function is normal is bonded to the wiring board whose electrical function is normal, the component is located at the opening of the wiring board, and an encapsulant is filled into the opening. As such, the process of the embedded component structure is completed. Thus, the process yield of the embedded component structure is increased.

Although the present invention has been described with reference to the above embodiments, it will be apparent to one of ordinary skill in the art that modifications to the described embodiments may be made without departing from the spirit of the invention. Accordingly, the scope of the invention will be defined by the attached claims and not by the above detailed descriptions.