Dice Rearrangement Package Structure Using Layout Process to Form a Compliant Configuration
A dice rearrangement package structure is provided, which a dice having an active surface and a bottom surface, and a plurality of pads is disposed on the active surface; a package body is provided to cover the dices and the plurality of pads being exposed; one ends of plurality of metal traces is electrically connected to the each pads; a protection layer is provided to cover the active surface and the other ends of the exposed metal traces is electrically connected to the plurality of conductive elements, the characteristic in that the package body is a B-stage material.
The current application is a divisional application of, and claims a priority to the U.S. patent application Ser. No. 12/191,382 filed on Aug. 14, 2008, which claims a foreign priority to a patent application in Taiwan with serial number 096149046 filed on Dec. 20, 2007.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention is related to a packaging method of semiconductor, more particularly, to a packaging method and a structure of dices rearrangement by a redistribution layer process to form a module with packaged body.
2. Description of the Prior Art
Miniaturized semiconductor dice has been a trend for its various functions. These semiconductor dices should be provided with more and more I/O pads within a smaller region, so the density of metal pins raises. Thus, the package technology of lead frame has been replaced by the technology of ball grid array (BGA). It is advantageous for BGA to provide more compact density and have solder less subject to damage and distorted.
With 3C products in fashion, such as cell phone, PDA or iPod, these 3C products are equipped with at least one systemic chip within a smaller volume. A wafer level package (WLP) has been developed to packaging a wafer before sawing. U.S. Pat. No. 5,323,051 discloses one kind of wafer level package. However, for WLP, the increasing number and the reduced pitches of the bonding pads result in signal coupling and noise. In addition, the reliability of package may be reduced because of the reduced pitches. Thus, WLP aforementioned may not satisfy the design of smaller dices.
For resolving the issue, U.S. Pat. No. 7,196,408 teaches a method for the semiconductor process. A plurality of good dices is after tested and sawed rearranged on another substrate for the sequential packaging process. Those rearranged dices have wider pitches for the suitable distribution of bonding pads on the dices, such as using fan out technology. Such a method may resolve the issues of signal coupling and noise caused by small pitches.
However, for the semiconductor chip with smaller and thinner packaging structure, before the wafer saw, the wafer may be processed by a thinning process, such as thinning the wafer in the thickness of 2 to 20 mil by backside lapping. Then the wafer is sawed to become dice units. Those thinned dices are rearranged on another substrate. Then, a molding process is applied on those thinned dices to form a molding structure. Because both the dices and the molding structure are thin very much, the stress from the molding structure itself would cause curl after the substrate is separated from the molding structure. The curl of the molding structure may make a sequential saw process difficult.
Accordingly, the present invention provides a packaging method for dices rearrangement to efficiently resolve the issue of curl on a molding package.
SUMMARY OF THE INVENTIONAccording to the problems described above, the object of the present invention is to provide a dice rearrangement package structure with the alignment mark and the package method package structure. Thus, the main object of the present invention is to provide a B-stage material to encapsulate the dice to increase the yield and the reliability.
Another object of the present invention is to provide the packaging method for dices rearrangement. The dices derived from a 12-inches wafer are rearranged on the substrate of an 8-inches wafer. The packaging equipments for the 8-inches wafer may be utilized to reduce the packaging cost.
Another object of the present invention is to provide the packaging method of dices rearrangement. All of dices packaged are known good ones to reduce the packaging and manufacturing costs.
According to above package structure, the present invention provides a dice rearrangement package method, which includes providing a first substrate having a top surface and a bottom surface, and a layer of sensitive material disposed on the top surface of the first substrate; providing a plurality of dices, each plurality of dices having an active surface and a reverse side, and a plurality of pads is disposed on the active surface of the dices; picking and placing the plurality of dices is flipped on the layer of sensitive material; providing a second substrate having a top surface and a bottom surface, and a layer of polymer material is disposed on the top surface of the second substrate; forming an encapsulated body to assembly the second substrate and the layer of polymer material with the top surface of the first substrate, so as to the layer of polymer material encapsulated the each dices and filled between the dices; separating the first substrate to expose the sensitive material; forming a plurality of openings within the sensitive material and the plurality of pads is to be exposed; forming a plurality of fan-out metal traces, and one ends of each plurality of metal traces is electrically connected the plurality of pads; forming a protective layer to encapsulate the active surface of the each dices and to expose the other ends of the plurality of metal traces; and cutting the encapsulated body to form a plurality of package body independently.
The present invention also provides another dice rearrangement package structure, which includes a dice having an active surface and a bottom surface, and the plurality of pads is on the active surface; an encapsulated body encapsulated the dice and exposed the plurality of pads; one ends of a plurality of fan-out metal traces electrically connected the each plurality of pads; a protective layer encapsulated the active surface of the dice and exposed the other ends of the metal traces; and a plurality of connecting components electrically connected the other ends of the plurality of metal traces, the characteristic in that: the encapsulated body is B-stage material.
The present invention still provides a dice rearrangement package structure, which includes a plurality of dices having an active surface and a bottom surface, and a plurality of pads on the active surface; an encapsulated body encapsulated the plurality of dices and exposed the pads on the active surface; one ends of a plurality of fan-out metal traces electrically connected the plurality of pads; a protective layer encapsulated the active surface of dice and exposed the other ends of the metal traces; and a plurality of connecting components electrically connected the other ends of the metal traces, the characteristic in that the encapsulated body is B-stage material.
The present invention provides a packaging method for dices rearrangement to re-dispose dices on another substrate for packaging. Following illustrations describe detailed the process or steps for understanding the present invention. Obviously, the present invention is not limited to the embodiments of a stacked structure; however, the preferred embodiments of the present invention are illustrated as followings. Besides, the present invention may be applied to other embodiments, not limited to ones mentioned.
In modern semiconductor packaging process, a wafer which has been implemented by a front end process is done by a thinning process in thickness about 2 to 20 mil. A sawing process is applied on the wafer to form a plurality of dice 110 units. Then, these dices 110 are transferred from a pick and place to another substrate 100. Shown in
Firstly,
Referring to
Then, the substrate 60 and the layer B-stage material 70 is pressed downward, so that the each dice 410 is encapsulated by the layer of B-stage material 70; in other words, the layer of B-stage material 70 encapsulates five sides among six sides of each dice 410, and the plurality of pads 412 on the active surface are connected to the layer of polymer material 30 on the substrate 20 and are thus not encapsulated by the layer of B-stage material 70, as shown in
Then, the layer of polymer material 30 is separated from the encapsulated body 70A, for example, the layer of polymer material 30 and the substrate are disposed in a tank (not shown in Figure) with de-ion water, so that the layer of polymer material 30 is separated from the encapsulated body 70A. It is obviously that the encapsulated body 70A encapsulated the each dices 410 and the pads 412 of each dices 410 are to be exposed. The strain of the encapsulated body 70A would be counterbalanced via the area is form be the plurality of sawing lines 414 on the surface of the encapsulated body 70A, therefore, the warpage of the encapsulated body 70A can be solved after the layer of polymer material 30 is separated from the encapsulated body 70A.
Next, a plurality of fan-out metal traces 90 is formed by redistribution layer (RDL) process, in which one ends of metal traces 90 is electrically connected each pads 412 on the active surface of the dice 410 and another ends of the metal traces 90 is extend toward the dice 410. Then, a protective layer 80 is formed for covering the active surface of the dice 412, metal traces 90, and the encapsulated body 70A by semiconductor process, and a plurality of openings 80 is formed on the other ends of each metal traces 90 as shown in
In above embodiments, the layer of polymer material 30 can be replaced with photosensitive layer. The B-stage material 70 is cured to form the encapsulated body 70A to encapsulate the plurality of dices 410 that combined with the photo sensitive layer 30, and the photo sensitive layer 30 is also cured. Thus, the photo sensitive layer 30 is drawn deep into the de-ionic water, and the photo sensitive layer 30 would be separated from the encapsulated body 70A to expose the pads 412 of each dices 410. Then, the plurality of fan-out metal traces 90 is formed by redistribution layer process, one ends of the metal traces 90 is electrically connected the each pads 412 on the active surface of the dices 410, and another ends of metal traces 90 is extended toward the peripheral of the dices 410. Next, a protective layer 80 is formed on the metal traces 90 via semiconductor process, and the plurality of openings 82 is formed on the other ends of each metal traces 90 as shown in
Otherwise, in above embodiment, the substrate 60 is retained to form on the reverse side of the each dices 410 with package body, thus, the substrate can be a heat dissipation device for the dice 410 with package body as shown in
According to above mentioned, the present invention also provide a module for multi-chip package body. Referring to
As shown in
Furthermore, the present invention also provides a plurality of dices with different dimensions to form a package module as shown in
Firstly, as shown in
Next, referring to
Then, a protective layer 80 (such as polyimide) is formed on the metal traces 90 by semiconductor process to cover the plurality of patterned metal traces 90, the active surface of dice 412, and the encapsulated body 70A, and a plurality of opening 80 is formed on the other ends of the metal traces 90 (as shown in
In another embodiment of this invention, the heat dissipation 60 is formed on the reverse side of encapsulated body as shown in
Referring to
Next, the polymer material 700 is alternatively performed a baking process to cure the layer of polymer material 700. Then, the layer of polymer material 700 is separated from the molding apparatus 500 to expose the planar surface of the layer of polymer material 700. However, it is noted that the photo sensitive layer 30 is not cured by the baking process, thus, the substrate 20 can be separated from the photo sensitive layer 30 and the photo sensitive layer 30 is retained on the active surface of the dices 410 as shown in
It is obviously, the five surfaces of each dices 410 is encapsulated by layer of polymer material 500, and the active surface of dices 410 is encapsulated by photo sensitive layer 30. Then, the reverse side of the cured layer of polymer material 500 is formed a plurality of sawing lines 414 by cutter (not shown in Figure), in which the depth of each sawing line is about 0.5 mil to 1 mil. Moreover, the width of sawing lines 414 is about 5 micrometers to 25 micrometers. In one preferred embodiment, the sawing lines 414 can be crisscross to be a reference line for cutting dices. Thus, the stress of the layer of polymer material 700 would be counterbalance by the area is made of sawing lines 414 when the photo sensitive layer 30 is separated from the layer of polymer material 700, thus, the warpage of the encapsulated body can be solved.
Due to the plurality of alignment mark 402 is formed on the reverse side of each dice 410, thus, the pads 412 of each dices 410 can be determined Then, the plurality of openings 32 is formed on the photo sensitive layer 30 and to expose the pads 412 of each dices 410 as shown in
Then the layer of polymer material 700 is cut to form a plurality of dice with package body. It is obviously, the five surfaces of each dices 410 is encapsulated by the layer of polymer material 700, and the active surface of the dices 410 is encapsulated by photo sensitive layer 30 merely as shown in
Similarly, the plurality of dices with same or different dimensions is applied for the above mentioned as shown in
Claims
1. A dice rearrangement package structure, comprising:
- a dice having an active surface and a bottom surface, a plurality of pads being disposed on said active surface and at least one alignment mark being formed on said bottom surface of said dice;
- an encapsulated body encapsulating five sides of said dice and exposing said plurality of pads on said active surface, wherein the material of said encapsulated body is B-stage material;
- one ends of a plurality of fan-out metal traces electrically connecting said plurality of pads;
- a protective layer encapsulating said active surface of said dice, said plurality of metal traces, and said encapsulated body, and exposing another ends of said plurality of metal traces; and
- a plurality of connecting components electrically connecting another ends of said plurality of metal traces.
2. The package structure according to claim 1, further comprising a substrate disposed on a reverse side of said encapsulated body.
3. The package structure according to claim 2, wherein the material of said substrate is selected from the group consisting of: glass, wafer, and metal material.
4. A dice rearrangement package structure, comprising:
- a dice having an active surface and a bottom surface, a plurality of pads being disposed on said active surface and at least one alignment mark being formed on said bottom surface of said dice;
- an encapsulated body encapsulating five sides of said dice and exposing only said active surface, wherein the material of said encapsulated body is a layer of B-stage material;
- a sensitive material encapsulating said active surface of said dice and exposing said plurality of pads;
- one ends of a plurality of fan-out metal traces electrically connecting said plurality of pads;
- a protective layer encapsulating said active surface of said dice, said plurality of metal traces, and said encapsulated body, and exposing another ends of said plurality of metal traces; and
- a plurality of connecting components electrically connecting another ends of said plurality of metal traces.
5. The package structure according to claim 4, further comprising a substrate disposed on a reverse side of said encapsulated body.
6. The package structure according to claim 5, wherein the material of said substrate is selected from the group consisting of: glass, wafer, and metal material.
7. A dice rearrangement package structure, comprising:
- a plurality of dices, each of said plurality of dices having an active surface and a bottom surface, a plurality of pads being disposed on said active surface and at least one alignment mark being formed on said bottom surface of said dice;
- an encapsulated body, encapsulating five sides of each of said plurality of dice and exposing only said plurality of pads on said active surface of each of said plurality of dices, wherein the material of said encapsulated body is a layer of B-stage material;
- a plurality of fan-out metal traces electrically connecting said plurality of pads;
- a protective layer encapsulating said active surface of said plurality of dices, said plurality of metal traces, and said encapsulated body, and exposing another ends of said plurality of metal traces; and
- a plurality of connecting components electrically connecting another ends of said plurality of metal traces.
8. The package structure according to claim 7, wherein said plurality of dices are of same dimensions.
9. The package structure according to claim 8, wherein said plurality of dices of same dimensions are light emitting devices (LED).
10. The package structure according to claim 8, wherein said plurality of dices of same dimensions are dynamic random access memories (DRAM).
11. The package structure according to claim 7, wherein said plurality of dices are of different dimensions.
12. The package structure according to claim 11, wherein said plurality of dices of different dimensions are selected from the group consisting of: microprocessor means, memory means, and memory controller means.
13. A dice rearrangement package structure, comprising:
- a plurality of dices, each of said plurality of dices having an active surface and a bottom surface, a plurality of pads being disposed on said active surface and at least an alignment mark being formed on said bottom surface of said dice;
- an encapsulated body encapsulating five sides of each of said plurality of dices and exposing said plurality of pads on said active surface, wherein the material of encapsulated body is B-stage material;
- a sensitive material encapsulating said active surface of said plurality of dice and exposing said plurality of pads;
- one ends of a plurality of fan-out metal traces electrically connecting said plurality of pads;
- a protective layer encapsulating said active surface of said plurality of dices, said plurality of metal traces, and said encapsulated boy, and exposing another ends of said plurality of metal traces; and
- a plurality of connecting components electrically connecting another ends of said plurality of metal traces.
14. The package structure according to claim 13, wherein said plurality of dices are of same dimensions.
15. The package structure according to claim 14, wherein said plurality of dice of same dimensions are light emitting devices (LED).
16. The package structure according to claim 14, wherein said plurality of dices of same dimensions are dynamic random access memories (DRAM).
17. The package structure according to claim 13, wherein said plurality of dices are of different dimensions.
18. The package structure according to claim 17, wherein said plurality of dices of different dimensions are selected from the group consisting of: microprocessor means, memory means, and memory controller means.
Type: Application
Filed: Mar 15, 2011
Publication Date: Jul 7, 2011
Inventors: GENG-SHIN SHEN (Hsinchu city), Yu-Ren Chen (Hsinchu city)
Application Number: 13/048,259
International Classification: H01L 23/495 (20060101);