阅读说明：本技术 具有图样坝层的晶片封装结构 (Chip package structure with pattern dam layer ) 是由 徐宏欣 张文雄 于 2019-10-30 设计创作，主要内容包括：本发明提供一种具有图样坝层的晶片封装结构,包含：基板,作为晶片封装结构的底层支撑结构；裸晶晶粒,设置于基板的一上表面,裸晶晶粒具有多个感测主动区；坝层,迭置于基板的上表面上并覆盖裸晶晶粒,坝层具有一开放井结构,位于多个感测主动区上方,开放井结构包含多个支柱,分布于裸晶晶粒上且由裸晶晶粒支撑,于多个支柱间形成多个开口,多个开口分别对应多个感测主动区的位置。本发明将光敏感材料涂布或贴于基板上作为坝层,坝层以光刻制造工艺或机械加工的方式形成开放井结构,开放井结构具有对应裸晶晶粒的感测主动区的图样的多个开口以及支柱,以于裸晶晶粒上对上层的保护玻璃具有更好的支撑,从而强化整体封装结构避免发生坝层破裂。(The invention provides a chip packaging structure with a pattern dam layer, comprising: the substrate is used as a bottom layer supporting structure of the chip packaging structure; the bare chip die is arranged on the upper surface of the substrate and is provided with a plurality of sensing active areas; the dam layer is superposed on the upper surface of the substrate and covers the bare chip grains, the dam layer is provided with an open well structure which is positioned above the sensing active areas, the open well structure comprises a plurality of supporting columns which are distributed on the bare chip grains and supported by the bare chip grains, a plurality of openings are formed among the supporting columns, and the openings respectively correspond to the positions of the sensing active areas. The invention coats or pastes the photosensitive material on the substrate as the dam layer, the dam layer forms the open well structure in the way of photoetching manufacturing process or machining, the open well structure has a plurality of openings and pillars corresponding to the patterns of the sensing active area of the bare crystal grain, so as to better support the upper protective glass on the bare crystal grain, thereby strengthening the whole packaging structure and avoiding the dam layer from cracking.)

1. A chip package structure with a pattern dam, comprising:

a substrate as the bottom supporting structure of the chip package structure;

a die disposed on an upper surface of the substrate, the die having a plurality of sensing active regions;

a dam layer overlying the upper surface of the substrate and covering the die, the dam layer having an open well structure over the sensing active areas, the open well structure including a plurality of pillars distributed over the die and supported by the die, the pillars having openings therebetween, the openings corresponding to the sensing active areas, respectively; and

and the protective glass is superposed on the dam layer and supported by the dam layer.

2. The wafer package structure of claim 1, wherein the dam is formed of a photosensitive material and the open well structure is formed in a photolithographic fabrication process.

3. The wafer package structure of claim 1, wherein the open well structure of the dam is formed by laser engraving, dry etching, wet etching, mechanical drilling, or micromachining.

4. The chip package structure as claimed in claim 1, wherein the dam layer is coated or attached on the substrate.

5. The wafer packaging structure of claim 1, wherein the plurality of openings of the open well structure are independent of each other and circular.

6. The wafer package structure of claim 1, wherein the plurality of openings of the open well structure are connected to each other and are circular.

7. The wafer package structure of claim 1, wherein the plurality of openings of the open well structure are connected to each other and are hexagonal.

8. The wafer packaging structure of claim 1, wherein the plurality of openings of the open well structure are independent of each other and are oval.

9. The wafer package structure of claim 1, wherein the open well structure having the plurality of openings and the plurality of pillars is configured to support the substrate when a plurality of backside processes are performed on a lower surface of the substrate opposite to the upper surface.

10. The chip package structure of claim 1, wherein the die is an optoelectronic chip, a photo-sensing chip, a proximity sensing chip, an optical micro-mirror, or a complementary metal oxide semiconductor image sensing chip.

Technical Field

The present invention relates to a chip package structure, and more particularly, to a photoelectric chip package structure with a patterned dam.

Background

For an optoelectronic chip package structure such as a photo-sensing chip, a proximity sensing chip or a Complementary Metal Oxide Semiconductor (CMOS) image sensor chip, before a protective glass is disposed on the top, a dam layer (dam) is usually stacked on the surface of the substrate to protect and prevent external micro-dust from falling into a sensing active area (sensor active area) of a die (chip), and also serves as an adhesion layer between the substrate and the protective glass and a support layer. Since the sensing active region (or multiple sensing active regions) of the die must be avoided when coating or attaching the dam layer, the conventional dam layer is usually a hollow structure with a hollow center and filled with the hollow center. Thus, all structural support to the cover glass is provided by the dam around the sensing active area of the die. In response to the trend of increasing resolution and increasing image quality, the size of the image sensing region is also enlarged, and thus the supporting capability of the conventional dam layer is also challenged, and may even risk cracking.

Disclosure of Invention

The present invention is directed to a chip package structure with an improved dam layer, and more particularly to a large die and a large sensing active region.

The embodiment of the invention provides a chip packaging structure with a pattern dam layer, which comprises a substrate, a bare crystal grain, a dam layer and protective glass. The substrate is used as a bottom layer supporting structure of the wafer packaging structure, the bare chip grain is arranged on an upper surface of the substrate, and the bare chip grain is provided with a plurality of sensing active areas. The dam layer is stacked on the upper surface of the substrate and covers the bare die grains. The dam layer has an open well structure (open well structure) located above the sensing active regions, the open well structure includes a plurality of pillars distributed on and supported by the die, a plurality of openings are formed between the pillars, and the openings respectively correspond to the sensing active regions. The protective glass is superposed on the dam layer and supported by the dam layer.

According to an embodiment of the present invention, a wafer package structure is provided, wherein the dam layer is made of a photosensitive material, and the open well structure is formed by a photolithography process.

According to an embodiment of the present invention, a wafer package structure is provided, wherein the open well structure of the dam layer is formed by laser engraving, dry etching, wet etching, mechanical drilling or micro-machining.

According to the chip package structure provided by the embodiment of the invention, the dam layer is coated or attached on the substrate.

According to an embodiment of the invention, the chip package structure is provided, wherein the plurality of openings of the open well structure are independent of each other and are circular.

According to an embodiment of the invention, a chip package structure is provided, in which the plurality of openings of the open well structure are connected to each other and have a circular shape.

According to an embodiment of the invention, a chip package structure is provided, in which the plurality of openings of the open well structure are connected to each other and have a hexagonal shape.

According to an embodiment of the invention, the chip package structure is provided, wherein the plurality of openings of the open well structure are independent of each other and have an oval shape.

According to an embodiment of the invention, when a plurality of backside processes are performed on a lower surface of the substrate opposite to the upper surface, the open well structure having the plurality of openings and the plurality of pillars is used to support the substrate.

According to an embodiment of the invention, the die is an optoelectronic chip, a photo-sensing chip, a proximity sensing chip, an optical micro-mirror or a complementary metal oxide semiconductor image sensing chip.

Drawings

FIG. 1 is a cross-sectional view of a chip package structure with a patterned dam according to an embodiment of the present invention;

FIG. 2 is a schematic view of a first embodiment of a patterned dam of the present invention;

FIG. 3 is a schematic view of a second embodiment of a patterned dam of the present invention;

FIG. 4 is a schematic view of a third embodiment of a patterned dam of the present invention;

FIG. 5 is a diagram of a fourth embodiment of a patterned dam of the present invention.

Description of the symbols

1 substrate

100 chip package structure

11 upper surface of the container

12 lower surface

2 bare crystal grain

21 sensing active region

3 dam layer

30 open well structure

31 support post

32. 33, 34, opening

35

4 protective glass

5 through-silicon-via

6 dielectric layer

7 rewiring layer

8 insulating protective layer

9 solder ball bump

Detailed Description

Certain terms are used throughout the description and following claims to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. In the present specification and the claims that follow, elements are distinguished not by differences in name but by differences in function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. Furthermore, the terms "coupled" or "connected" are used herein to encompass any direct and indirect electrical or structural connection. Thus, if a first device couples to a second device, that connection may be through a direct electrical/structural connection, or through an indirect electrical/structural connection via other devices and connections.

Referring to fig. 1, fig. 1 is a cross-sectional view illustrating a chip package structure with a patterned dam according to an embodiment of the invention. The wafer package structure 100 of the present invention may be a complementary metal oxide semiconductor image sensor (CIS) wafer or a Chip Scale Package (CSP) with Through Silicon Via (TSV) package, but not limited thereto, and includes a photo-electric die or a bare die with a sensing active area (sensor active areas). The chip package structure 100 includes a substrate 1 having an upper surface 11 and a lower surface 12 opposite to each other, a bare die 2, a dam layer 3, and a cover glass 4.

Referring to fig. 2, fig. 2 is a schematic view of a first embodiment of a pattern dam according to the present invention. The substrate 1 serves as a bottom supporting structure of the chip package structure 100, and the bare chip die 2 is disposed on the upper surface 11. In the embodiment of the present invention, the bare die 2 may be an optoelectronic chip, a photo-sensing chip, a proximity sensing chip, an optical micro-mirror or a complementary metal oxide semiconductor image sensing chip, which has a plurality of sensing active regions 21 that need to be exposed by the protective glass 4. The dam layer 3 is stacked on the upper surface 11 of the substrate 1 to support the cover glass 4 while protecting and preventing external particles or moisture from entering the sensing active area of the die 2. In the packaging manufacturing process, the dam layer 3 may be coated or attached on the substrate 1 and cover the bare die 2, and the substrate 1 and the cover glass 4 are bonded in the subsequent manufacturing process.

In this embodiment, the dam layer 3 coated or attached on the substrate 1 may be made of a photosensitive material, which may be formed by a photolithography process to have a specific pattern corresponding to the sensing active region 21 of the die 2. More specifically, the dam layer 3 is exposed and developed in a photolithography process to form an open well structure 30 on the sensing active regions 21, the open well structure 30 has a plurality of pillars 31 distributed on the die 2, a plurality of openings 32 are formed between the pillars 31, the openings 32 form a pattern corresponding to the positions of the sensing active regions 21, and the pillars 31 are supported by the die 2. In other embodiments, the open well structure 30 of the dam 3 may also be laser engraved, dry etched, wet etched, mechanically drilled, or micro machined to form the pillars 31 and openings 32.

After the dam 3 having the patterned open well structure 30 is formed on the substrate 1 and coated or attached to the substrate 1, the cover glass 4 is then stacked on the dam 3 and adhered to the dam 3 and supported by the dam 3, so that in the present invention, the cover glass 4 is supported by the upper surface 11 of the substrate 1 not only by the surrounding area of the dam 3 but also by the plurality of pillars 30 of the open well structure 30.

In particular, the open well structure 30 of the present invention can also act as a support for the substrate 1 when the wafer package structure 100 is subjected to the backside fabrication process on the lower surface 12 of the substrate 1 a plurality of times. The backside fabrication process may include, but is not limited to, a back grinding process to perform a thickness reduction operation on the substrate 1, a mask for coating a dielectric layer 6 (such as SiOx or SiNx), a through silicon via 5(TSV) etching process, a redistribution layer 7(RDL) wiring using copper, aluminum or any conductive material, an insulating protection layer 8(passivation) coating (ball-planting mask, synthetic resin, inorganic dielectric layer …, etc.), and solder bumps 9.

In the embodiment of fig. 2, the plurality of openings 32 of the open well structure 30 are independent of each other and are circular, while fig. 3-5 illustrate other embodiments of the patterned dam of the present invention. For example, fig. 3 is a schematic view of a second embodiment of the patterned dam of the present invention, in which the openings 33 are connected to each other and have a circular shape, fig. 4 is a schematic view of a third embodiment of the patterned dam of the present invention, in which the openings 34 are connected to each other and have a hexagonal shape, and fig. 5 is a schematic view of a fourth embodiment of the patterned dam of the present invention, in which the openings 35 are independent from each other and have an elliptical shape. It is specifically noted that the open-well structure pattern in the embodiment of the present invention is used as an illustrative embodiment, and actually has a corresponding pattern according to the design of the die 2.

The invention coats or pastes the photosensitive material on the substrate as the dam layer, the dam layer forms the open well structure in the way of photoetching manufacturing process or machining, the open well structure has a plurality of openings and pillars corresponding to the patterns of the sensing active area of the bare crystal grain, so as to better support the upper protective glass on the bare crystal grain, thereby strengthening the whole packaging structure and avoiding the dam layer from cracking.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.