Semiconductor chip package structure for achieving flip-chip type electrical connection without using wire-bonding process and method for making same

A semiconductor chip package structure for achieving flip-chip electrical connection without using a wire-bonding process includes a package unit, a semiconductor chip, a first insulative layer, first conductive layers, a second insulative layer, and second conductive layers. The package unit has a receiving groove. The semiconductor chip is received in the receiving groove and has a plurality of conductive pads disposed on its top surface. The first insulative layer is formed between the conductive pads to insulate the conductive pads. The first conductive layers are formed on the first insulative layer and the package unit, and one side of each first conductive layer is electrically connected to the corresponding conductive pad. The second insulative layer is formed between the first conductive layers in order to insulate the first conductive layers from each other. The second conductive layers are respectively formed on the other opposite sides of the first conductive layers.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a semiconductor chip package structure and a method for making the same, in particular, to a semiconductor chip package structure for achieving flip-chip type electrical connection without using wire-bonding process and a method for making the same.

2. Description of the Related Art

Referring toFIG. 1, a known LED package structure is packaged via a wire-bonding process. The known LED package structure includes a substrate1a, an LED (light emitting diode)2adisposed on the substrate, two wires3a, and a phosphor resin body4a.

The LED2ahas a light-emitting surface20aopposite to the substrate1a. The LED2ahas a positive pole area21aand a negative pole area22aelectrically connected to two corresponding positive and negative pole areas11a,12aof the substrate1avia the two wires3arespectively. Moreover, the LED2aand the two wires3aare covered with the phosphor resin body4afor protecting the LED2a.

However, the method of the prior art not only increases manufacture time and cost, but also leads to uncertainty about the occurrence of bad electrical connections in the LED package structure of the prior art resulting from the wire-bonding process. Moreover, the two sides of the two wires3aare respectively disposed on the positive and negative pole areas21a,22a. Hence, when the light source of the LED2ais projected outwardly from the light-emitting surface20aand through the phosphor resin body4a, the two wires3awould produce two shadow lines within the light emitted by the LED2aand thus affect the LED's light-emitting efficiency.

SUMMARY OF THE INVENTION

In view of the aforementioned issues, the present invention provides a semiconductor chip package structure for achieving flip-chip type electrical connection without using wire-bonding process and a method for making the same. Because the semiconductor chip package structure of the present invention can achieve electrical connection without using a wire-bonding process, the present invention can omit the wire-bonding process and avoid bad electrical connection in the semiconductor chip package structure.

To achieve the above-mentioned objectives, the present invention provides a semiconductor chip package structure for achieving flip-chip type electrical connection without using wire-bonding process, including: a package unit, at least one semiconductor chip, a first insulative unit, a first conductive unit, a second insulative unit and a second conductive unit. The package unit has at least one receiving groove. The at least one semiconductor chip is received in the at least one receiving groove and has a plurality of conductive pads disposed on its top surface. The first insulative unit has at least one first insulative layer formed between the conductive pads in order to insulate the conductive pads from each other. The first conductive unit has a plurality of first conductive layers formed on the at least one first insulative layer and the package unit, and one side of each first conductive layer is electrically connected to the corresponding conductive pad. The second insulative unit has at least one second insulative layer formed between the first conductive layers in order to insulate the first conductive layers from each other. The second conductive unit has a plurality of second conductive layers respectively formed on the other opposite sides of the first conductive layers.

To achieve the above-mentioned objectives, the present invention provides a method of making semiconductor chip package structures for achieving flip-chip type electrical connection without using wire-bonding process, including: providing at least two semiconductor chips, wherein each semiconductor chip has a plurality of conductive pads; forming at least one first insulative layer between the conductive pads in order to insulate the conductive pads from each other; arranging the at least two semiconductor chips on an adhesive polymeric substance, wherein the conductive pads face the adhesive polymeric substance; covering the at least two semiconductor chips with a package unit; overturning the package unit and removing the adhesive polymeric substance in order to expose the conductive pads; forming a plurality of first conductive layers on the at least one first insulative layer for respectively and electrically connecting to the conductive pads; forming a plurality of second insulative layers between the first conductive layers in order to insulate the first conductive layers from each other; respectively forming a plurality of second conductive layers on the first conductive layers for electrically connecting to the conductive pads; and forming the semiconductor chip package structures by cutting each second conductive layer, each first conductive layer and the package unit.

Therefore, the semiconductor chip package structure of the present invention can achieve electrical connection without using a wire-bonding process, so that the present invention can omit the wire-bonding process and avoid bad electrical connection in the semiconductor chip package structure.

In order to further understand the techniques, means and effects the present invention takes for achieving the prescribed objectives, the following detailed descriptions and appended drawings are hereby referred, such that, through which, the purposes, features and aspects of the present invention can be thoroughly and concretely appreciated; however, the appended drawings are merely provided for reference and illustration, without any intention to be used for limiting the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS.2and2A-2L, the present invention provides a method of making semiconductor chip package structures for achieving flip-chip type electrical connection without using wire-bonding process, including as follows:

Step S100is: referring toFIGS. 2 and 2A, providing at least two semiconductor chips1; wherein each semiconductor chip1has a plurality of conductive pads10.

Step S102is: referring toFIGS. 2 and 2B, forming a first insulative substance B1on the at least two semiconductor chips1for covering the conductive pads10. In addition, the first insulative substance B1is formed on the at least two semiconductor chips1by printing, coasting or spraying, and the first insulative substance B1is hardened by pre-curing.

Step S104is: referring toFIGS. 2 and 2C, removing one part of the first insulative substance B1to form at least one first insulative layer2between the conductive pads10for exposing the conductive pads10. In other words, the one part of the first insulative substance B1is removed by matching an exposure process, a development process and an etching process to form the at least one first insulative layer2between the conductive pads10in order to insulate the conductive pads10from each other.

Step S106is: referring toFIGS. 2 and 2D, arranging the at least two semiconductor chips1on an adhesive polymeric substance A; wherein the conductive pads10face the adhesive polymeric substance A. In addition, the adhesive polymeric substance A is an adhesive removable substrate that is made of glass, ceramic, crystal substance or plastic, and each semiconductor chip1can be an LED (light emitted diode) chip.

Step S108is: referring toFIGS. 2 and 2E, covering the at least two semiconductor chips1with a package unit3. In addition, the at least two semiconductor chips1are covered with the package unit3by coating, spraying, printing or pressure molding. In the present embodiment, the package unit2can be a phosphor substance, and the conductive pads10of each semiconductor chip1are divided into a positive electrode pad100and a negative electrode pad101. In addition, each semiconductor chips1has a light-emitting surface102on its bottom surface and opposite the conductive pads10.

Step S110is: referring toFIGS. 2 and 2F, overturning the package unit3and removing the adhesive polymeric substance A in order to expose the conductive pads10.

Step S112is: referring toFIGS. 2 and 2G, forming a first conductive substance C1on the at least one first insulative layer2, the conductive pads10and package unit3. In addition, the first conductive substance C1is formed on the at least one first insulative layer2, the conductive pads10and package unit3by evaporating, sputtering, electroplating or electroless plating.

Step S114is: referring toFIGS. 2 and 2H, removing one part of the first conductive substance C1to form a plurality of first conductive layers4respectively and electrically connected to the conductive pads10. In other words, the one part of the first conductive substance C1is removed by matching an exposure process, a development process and an etching process to form the first conductive layers4on the at least one first insulative layer2and the package unit3for respectively and electrically connecting to the conductive pads10.

Step S116is: referring toFIGS. 2 and 2I, forming a second insulative substance B2on the first conductive layers4and the at least one first insulative layer2. In addition, the second insulative substance B2is formed on the first conductive layers4and the at least one first insulative layer2by printing, coasting or spraying, and the second insulative substance B2is hardened by pre-curing. Furthermore, the first conductive layers4are divided into a plurality of first part conductive layers41and a plurality of second part conductive layers42. One side of each first part conductive layer41is electrically connected to the corresponding conductive pad10, and two opposite sides of each second part conducive layer42are electrically connected to the two corresponding conductive pads10.

Step S118is: referring toFIGS. 2 and 2J, removing one part of the second insulative substance B2to form a plurality of second insulative layers5for exposing one part of the first conductive layers4. In other words, the one part of the second insulative substance B2is removed by matching an exposure process, a development process and an etching process to form the second insulative layers5between the first conductive layers4in order to insulate the first conductive layers4from each other. Furthermore, each second insulative layer5is between each first part conductive layer41and each second part conductive layer42.

Step S120is: referring toFIGS. 2 and 2K, respectively forming a plurality of second conductive layers6on the first conductive layers4for electrically connecting to the conductive pads10. In addition, the second conductive layers6are respectively formed on the first conductive layers4by evaporating, sputtering, electroplating or electroless plating. Furthermore, one part of the second conductive layers6(the outer second conductive layers6) is electrically connected to the opposite side of each first part conductive layer41, and the other part of the second conductive layers6(the center second conductive layers6) is electrically disposed on a center position of each second part conductive layer42.

Step S122is: referring toFIGS. 2 and 2L, forming at least two semiconductor chip package structures (P1, P2) by a cutting process along the dotted line X inFIG. 2K. In other words, the center second conductive layer6, the second part conductive layer42of each first conductive layer4and the package unit3are cut along the dotted line X inFIG. 2Kto form the at least two semiconductor chip package structures (P1, P2).

Therefore, each semiconductor chip package structure (P1, P2) has a semiconductor chip1, a package unit3′, a first insulative unit, a first conductive unit, a second insulative unit, and a second conductive unit.

The package unit3′ has at least one receiving groove30′. The semiconductor chip1is received in the at least one receiving groove30′ and has a plurality of conductive pads10disposed on its top surface. The first insulative unit has at least one first insulative layer2′ formed between the conductive pads10in order to insulate the conductive pads10from each other.

The first conductive unit has a plurality of first conductive layers (4,4′) formed on the at least one first insulative layer2′ and the package unit3′, and one side of each first conductive layer (4,4′) is electrically connected to the corresponding conductive pad10. The second insulative unit has at least one second insulative layer5formed between the first conductive layers (4,4′) in order to insulate the first conductive layers (4,4′) from each other. The second conductive unit has a plurality of second conductive layers (6,6′) respectively formed on the other opposite sides of the first conductive layers (4,4′).

Furthermore, there are some different choices of the semiconductor chips1and the package unit3in the present embodiment, as follows:

1. Each semiconductor chip1can be an LED (light-emitting diode) chip, and the package unit3can be a phosphor substance. The conductive pads10of each semiconductor chip1are divided into a positive electrode pad100and a negative electrode pad101. For example, the LED chip is a blue LED chip. Therefore, the match of the blue LED chip and the phosphor substance can generate white light.

2. Each semiconductor chip1can be an LED (light-emitting diode) chip, and the package unit3can be a transparent substance. The conductive pads10of each semiconductor chip1are divided into a positive electrode pad100and a negative electrode pad101. For example, the LED chip is a white LED chip (composed of red, green and blue LED chips). Therefore, the match of the white LED chip and the transparent substance can generate white light.

3. Each semiconductor chip1can be a light-sensing chip, and the package unit3can be a transparent substance or a translucent substance. The conductive pads10of each semiconductor chip1at least are divided into an electrode pad and a signal pad.

4. Each semiconductor chip1can be an IC (Integrated Circuit) chip, and the package unit3can be an opaque substance. The conductive pads10of each semiconductor chip1at least are divided into an electrode pad and a signal pad.

The above-mentioned descriptions represent merely the preferred embodiment of the present invention, without any intention to limit the scope of the present invention thereto. Various equivalent changes, alternations or modifications based on the claims of present invention are all consequently viewed as being embraced by the scope of the present invention.