阅读说明：本技术 芯片级传感器封装结构 (Chip-level sensor packaging structure ) 是由 洪立群 李建成 杜修文 于 2019-02-27 设计创作，主要内容包括：本发明公开一种芯片级传感器封装结构,包含感测芯片、设置于感测芯片顶面的环形支撑体、设置于环形支撑体上的透光件、封装体、及重置线路层。所述透光件、环形支撑体、及感测芯片共同包围形成有封闭空间。封装体包围感测芯片外侧缘、环形支撑体外侧缘、及透光件外侧缘,并且感测芯片的底面与透光件的一表面裸露于封装体之外。重置线路层直接成形于感测芯片的底面与封装体的底缘。重置线路层的底面形成有电性耦接于感测芯片的多个外接点。多个外接点中的部分位于感测芯片朝向重置线路层底面正投影所形成的投影区域的外侧。据此,通过结构上的改良,以使透光件的外侧缘被封装体所包覆,而提升结合强度,以避免在温度循环可靠度测试中引起脱层现象。(The invention discloses a chip-level sensor packaging structure which comprises a sensing chip, an annular supporting body arranged on the top surface of the sensing chip, a light-transmitting piece arranged on the annular supporting body, a packaging body and a reset circuit layer. The light-transmitting piece, the annular supporting body and the sensing chip are jointly surrounded to form a closed space. The package body surrounds the outer edge of the sensing chip, the outer edge of the annular support body and the outer edge of the light-transmitting piece, and the bottom surface of the sensing chip and one surface of the light-transmitting piece are exposed out of the package body. The reset circuit layer is directly formed on the bottom surface of the sensing chip and the bottom edge of the packaging body. The bottom surface of the reset circuit layer is provided with a plurality of external contacts electrically coupled with the sensing chip. The parts of the external contacts are positioned outside a projection area formed by orthographic projection of the sensing chip towards the bottom surface of the reset circuit layer. Therefore, through the structural improvement, the outer edge of the light-transmitting piece is wrapped by the packaging body, so that the bonding strength is improved, and the delamination phenomenon caused in a temperature cycle reliability test is avoided.)

1. A chip-scale sensor package structure, the chip-scale sensor package structure comprising:

a sensing chip, including a sensing region located on a top surface of the sensing chip, a plurality of inner contacts located on a bottom surface of the sensing chip, and a plurality of wires passing from the top surface of the sensing chip to the bottom surface of the sensing chip, the plurality of wires being respectively connected to the plurality of inner contacts and electrically coupled to the sensing region;

the annular supporting body is arranged on the top surface of the sensing chip and positioned outside the sensing region;

the light-transmitting piece comprises a first surface and a second surface which are positioned on two opposite sides, and the second surface of the light-transmitting piece is arranged on the annular supporting body, so that the light-transmitting piece, the annular supporting body and the sensing chip are jointly surrounded to form a closed space;

the packaging body surrounds the outer edge of the sensing chip, the outer edge of the annular supporting body and the outer edge of the light-transmitting piece; wherein the bottom surface of the sensing chip and the first surface of the light-transmitting member are exposed outside the package body; and

a reset circuit layer formed directly on the bottom surface of the sensing chip and the bottom edge of the package body, wherein a plurality of external contacts electrically coupled to the plurality of internal contacts are formed on the bottom surface of the reset circuit layer; wherein, some of the outer contacts are located outside a projection area formed by orthographic projection of the inner contacts towards the bottom surface of the reset line layer.

2. The chip scale sensor package structure of claim 1, wherein the bottom surface of the sensing chip is coplanar with the bottom edge of the package body.

3. The chip scale sensor package structure of claim 1, wherein the first surface of the optically transparent member is coplanar with a top edge of the package body.

4. The chip scale sensor package structure of claim 1, wherein the package body comprises a liquid package body and a molded package body, the liquid package body surrounds the outer edge of the sensing chip, the outer edge of the ring support, and the outer edge of the light-transmissive member, and the bottom surface of the sensing chip is coplanar with a bottom edge of the liquid package body; the molded package body is formed on the top edge of the liquid package body.

5. The chip scale sensor package structure of claim 1, wherein the top surface of the sensing chip, the outer edge of the ring support, and the second surface of the light-transmissive member together surround a ring-shaped recess, and the package body is filled in the ring-shaped recess.

6. The chip scale sensor package structure of claim 5, wherein a projection area formed by orthographically projecting the light-transmitting member toward the top surface of the sensing chip is located inside the outer edge of the sensing chip.

7. The chip scale sensor package structure of claim 1, wherein the outer edge of the sensing chip, the outer edge of the ring support, and the outer edge of the optically transparent member are disposed in a coplanar manner.

8. The chip scale sensor package structure of claim 1, wherein an outer edge of the package body is coplanar with an outer edge of the reset wiring layer.

9. The chip scale sensor package structure of claim 1, wherein the light-transmissive member comprises a plate-shaped portion, a supporting portion having a ring shape, and a bonding layer for bonding the plate-shaped portion and the supporting portion; wherein a surface of the plate-shaped portion remote from the support portion is defined as the first surface, and a surface of the support portion remote from the plate-shaped portion is defined as the second surface.

10. The chip scale sensor package structure of claim 9, wherein the bonding layer is a glass glue layer, an epoxy layer, or a solder layer.

Technical Field

The present disclosure relates to packaging structures, and particularly to a chip-scale sensor packaging structure.

Background

In the conventional chip scale sensor package structure, the light-transmitting member (such as optical glass) is only adhered and fixed by a glue layer at the bottom edge thereof, and the size of the light-transmitting member is substantially equal to that of the conventional chip scale sensor package structure, so that when the conventional chip scale sensor package structure is subjected to a temperature cycle reliability test (TCT), a delamination phenomenon is easily generated between the light-transmitting member and the glue layer, and the test cannot be passed.

The present inventors have considered that the above-mentioned drawbacks can be improved, and have made intensive studies and use of scientific principles, and finally have proposed the present invention which is designed reasonably and effectively to improve the above-mentioned drawbacks.

Disclosure of Invention

The embodiment of the invention provides a chip-scale sensor packaging structure, which can effectively avoid possible defects in the conventional chip-scale sensor packaging structure.

The embodiment of the invention discloses a chip-level sensor packaging structure, which comprises: a sensing chip, including a sensing region located on a top surface of the sensing chip, a plurality of inner contacts located on a bottom surface of the sensing chip, and a plurality of wires passing from the top surface of the sensing chip to the bottom surface of the sensing chip, the plurality of wires being respectively connected to the plurality of inner contacts and electrically coupled to the sensing region; the annular supporting body is arranged on the top surface of the sensing chip and positioned outside the sensing region; the light-transmitting piece comprises a first surface and a second surface which are positioned on two opposite sides, and the second surface of the light-transmitting piece is arranged on the annular supporting body, so that the light-transmitting piece, the annular supporting body and the sensing chip are jointly surrounded to form a closed space; the packaging body surrounds the outer edge of the sensing chip, the outer edge of the annular supporting body and the outer edge of the light-transmitting piece; wherein the bottom surface of the sensing chip and the first surface of the light-transmitting member are exposed outside the package body; a reset circuit layer formed directly on the bottom surface of the sensing chip and the bottom edge of the package body, wherein a plurality of external contacts electrically coupled to the plurality of internal contacts are formed on the bottom surface of the reset circuit layer; wherein, some of the outer contacts are located outside a projection area formed by orthographic projection of the inner contacts towards the bottom surface of the reset line layer.

Preferably, the bottom surface of the sensing chip is coplanar with the bottom edge of the package.

Preferably, the first surface of the light-transmissive member is coplanar with a top edge of the package body.

Preferably, the package includes a liquid package and a molded package, the liquid package surrounds the outer edge of the sensor chip, the outer edge of the ring support, and the outer edge of the light-transmissive member, and the bottom surface of the sensor chip is coplanar with the bottom edge of the liquid package; the molded package body is formed on the top edge of the liquid package body.

Preferably, an annular groove is formed by the top surface of the sensing chip, the outer edge of the annular supporting body, and the second surface of the light-transmitting member, and the package is filled in the annular groove.

Preferably, the light-transmitting member is located inside the outer edge of the sensing chip, and a projection area formed by orthographically projecting the light-transmitting member toward the top surface of the sensing chip is located inside the outer edge of the sensing chip.

Preferably, the outer edge of the sensing chip, the outer edge of the ring-shaped support, and the outer edge of the light-transmitting member are disposed in a coplanar manner.

Preferably, an outer edge of the package is coplanar with an outer edge of the reset wire layer.

Preferably, the light-transmitting member includes a plate-shaped portion, an annular supporting portion, and a bonding layer for bonding the plate-shaped portion and the supporting portion; wherein the plate-like portion surface remote from the support portion is defined as the first surface, and the support portion surface remote from the plate-like portion is defined as the second surface.

Preferably, the bonding layer is a glass glue layer, an epoxy resin layer, or a welding layer.

In summary, the chip-scale sensor package structure disclosed in the embodiments of the invention is structurally improved (for example, the reset circuit layer is directly formed on the bottom surface of the sensing chip and the bottom edge of the package body), so that the outer edge of the light-transmitting element can be covered by the package body, and the bonding strength of the light-transmitting element in the chip-scale sensor package structure is further improved, thereby preventing the chip-scale sensor package structure from delaminating during the temperature cycling reliability test.

For a better understanding of the nature and technical content of the present invention, reference should be made to the following detailed description of the invention and the accompanying drawings, which are provided for illustration purposes only and are not intended to limit the scope of the invention in any way.

Drawings

Fig. 1 is a schematic cross-sectional view of a chip-scale sensor package structure according to a first embodiment of the invention.

Fig. 2 is a schematic view of step S110 of a method for manufacturing a chip-scale sensor package structure according to a first embodiment of the invention.

Fig. 3 is a schematic diagram of step S130 of a method for manufacturing a chip-scale sensor package structure according to a first embodiment of the invention.

Fig. 4 is a schematic diagram of step S150 of a method for manufacturing a chip-scale sensor package structure according to a first embodiment of the invention.

Fig. 5 is a schematic diagram of step S170 of a method for manufacturing a chip-scale sensor package structure according to a first embodiment of the invention.

Fig. 6 is a schematic cross-sectional view of a chip-scale sensor package structure according to a second embodiment of the invention.

Detailed Description

Please refer to fig. 1 to 6, which are exemplary embodiments of the present invention, and it should be noted that, in the exemplary embodiments, related numbers and shapes mentioned in the accompanying drawings are only used for describing the embodiments of the present invention in detail, so as to facilitate the understanding of the contents of the present invention, and not for limiting the scope of the present invention.

[ example one ]

As shown in fig. 1 to 5, it is a first embodiment of the present invention. The present embodiment discloses a chip-scale sensor package structure 100; that is, the size of any sensor package is not up to the chip level, and the design basis of the sensor package is different from that of the chip-level sensor package 100 in the embodiment, so there is no comparative basis between the two.

The chip scale sensor package structure 100 includes a sensing chip 1, a ring-shaped support 2 disposed on the sensing chip 1, a light-transmitting member 3 disposed on the ring-shaped support 2, a package 4 surrounding the periphery of the above components, a reset circuit layer 5 formed on the package 4 and the lower edge of the sensing chip 1, and a plurality of solder balls 6 disposed on the outer surface of the reset circuit layer 5.

It should be noted that, for convenience of describing the chip-scale sensor package structure 100 of the present embodiment, the drawings are shown in cross-sectional views, but it should be understood that corresponding structures are also formed at portions of the chip-scale sensor package structure 100 not shown in the drawings. For example: fig. 1 shows only one row of solder balls 6, but other solder balls 6 are also included in the chip-scale sensor package structure 100 not shown in fig. 1. The structure and connection relationship of the components of the chip-scale sensor package structure 100 of the present embodiment will be described below.

As shown in fig. 1, the sensing chip 1 is illustrated as an image sensing chip in the present embodiment, but not limited thereto. The sensing chip 1 includes a top surface 11 and a bottom surface 12 on opposite sides, and an outer edge 13 connected to the edges of the top surface 11 and the bottom surface 12. The sensing chip 1 has a sensing region 111 at the approximate center of the top surface 11 and a plurality of inner contacts 121 at the bottom surface 12. The sensing chip 1 further includes a plurality of conductive lines 14 penetrating from the top surface 11 to the bottom surface 12 thereof, and the plurality of conductive lines 14 are respectively connected to the plurality of inner contacts 121 and electrically coupled to the sensing region 111.

The ring-shaped supporting body 2 is disposed on the top surface 11 of the sensing chip 1 and located outside (or surrounding) the sensing region 111. The annular supporting body 2 of the present embodiment is, for example, a rubber material, and when viewed along the horizontal direction in fig. 1, the outer diameter of the annular supporting body 2 is smaller than the outer diameter of the sensing chip 1; that is, an outer edge 21 of the ring support 2 is spaced apart from the outer edge 13 of the sensor chip 1, but the invention is not limited thereto.

The light-transmitting member 3 includes a first surface 31 and a second surface 32 on opposite sides, and an outer edge 33 connected to edges of the first surface 31 and the second surface 32. The second surface 32 of the light-transmitting member 3 is disposed on the ring-shaped supporting body 2 (that is, the ring-shaped supporting body 2 is sandwiched between the top surface 11 of the sensing chip 1 and the second surface 32 of the light-transmitting sheet 3), so that the light-transmitting member 3, the ring-shaped supporting body 2, and the sensing chip 1 together surround and form an enclosed space E.

In this embodiment, the light-transmitting sheet 3 is illustrated as a transparent flat glass, and the outer diameter of the light-transmitting sheet 3 is smaller than the outer diameter of the sensing chip 1 when viewed along the horizontal direction in fig. 1; that is, the light-transmitting member 3 forms a projection area by orthographically projecting toward the top surface 11 of the sensor chip 1, which is located inside the outer edge 13 of the sensor chip 1, but the invention is not limited thereto. Furthermore, as viewed in the horizontal direction of fig. 1, the outer diameter of the light-transmitting member 3 is larger than the outer diameter of the ring-shaped supporting member 2, so that an annular groove G is formed by the top surface 11 of the sensor chip 1, the outer edge 21 of the ring-shaped supporting member 2, and the second surface 32 of the light-transmitting member 3.

However, in other embodiments not shown in the present disclosure, the outer diameter of the light-transmitting sheet 3 may be equal to or larger than the outer diameter of the sensing chip 1, and the outer diameter of the ring-shaped supporting body 2 may be equal to the outer diameter of the sensing chip 1. Alternatively, the outer edge 13 of the sensor chip 1, the outer edge 21 of the ring support 2, and the outer edge 33 of the light-transmitting member 3 are disposed in a coplanar manner.

The package 4 is annular and surrounds the outer edge 13 of the sensor chip 1, the outer edge 21 of the annular support 2, and the outer edge 33 of the light-transmitting member 3, and the package 4 is filled in the annular groove G. The bottom surface 12 of the sensing chip 1 and the first surface 31 of the light-transmitting member 3 are exposed outside the package 4, and the bottom surface 12 of the sensing chip 1 is coplanar with a bottom edge 41 of the package 4 in this embodiment.

In more detail, the package 4 includes a liquid package 4a and a molded package 4b, and the liquid package 4a surrounds the outer edge 13 of the sensor chip 1, the outer edge 21 of the ring support 2, and the outer edge 33 of the light-transmitting member 3. The bottom surface 12 of the sensing chip 1 is coplanar with the bottom edge of the liquid package 4a, the molded package 4b is formed on the top edge of the liquid package 4a, and the outer edge of the liquid package 4a is aligned with the outer edge of the molded package 4 b.

However, in other embodiments not shown in the present disclosure, the package 4 may be only a liquid package 4a (i.e., the package 4 in fig. 1 omits the molded package 4 b); alternatively, the package 4 may be only the molded package 4b, and a top edge 42 of the package 4 is coplanar with the first surface 31 of the light-transmitting member 3.

The reset circuit layer 5 is formed directly on the bottom surface 12 of the sensing chip 1 and the bottom edge 41 of the package 4, and the outer edge 43 of the package 4 is preferably coplanar with an outer edge 53 of the reset circuit layer 5 in this embodiment, but the invention is not limited thereto.

The bottom surface 51 of the reset circuit layer 5 is formed with a plurality of external contacts 52 electrically coupled to the plurality of internal contacts 121. Further, the inner contacts 121 of the sensing chip 1 may form the outer contacts 52 having a larger pitch by the reset wiring layer 5. That is, the reset circuit layer 5 corresponds to a circuit fan-out structure (circuit fan-out structure). In other words, a portion of the external connection point 52 is located outside a projection area formed by orthographic projections of the inner connection points 121 toward the bottom surface 51 of the reset circuit layer 5, and a portion of the reset circuit layer 5 located below the package 4 is preferably provided with at least a portion of the external connection points 52, but the invention is not limited thereto.

Furthermore, a plurality of solder balls 6 are respectively disposed on the plurality of external contacts 52 on the bottom surface 51 of the reset circuit layer 5, so as to facilitate the chip-scale sensor package structure 100 to be soldered and fixed on an electronic component (e.g., a circuit board).

The above is a description of the structure of the chip-scale sensor package structure 100 of the present embodiment, and for the sake of better understanding of the present embodiment, the following generally describes a method for manufacturing the chip-scale sensor package structure 100, but the chip-scale sensor package structure 100 of the present embodiment is not limited to be manufactured by the method. In the present embodiment, the method for manufacturing the chip-scale sensor package structure 100 includes a pre-step S110, a packaging step S130, an inverted wiring step S150, and a ball-mounting step S170, and each of the steps S110 to S170 will be briefly described below.

The pre-step S110: as shown in fig. 2, a semi-finished product M is provided, which includes the sensing chip 1, the ring-shaped supporting body 2 disposed on the sensing chip 1, and the light-transmitting member 3 disposed on the ring-shaped supporting body 2.

The packaging step S130: as shown in fig. 3, the package 4 is formed on the outer edge of the semi-finished product M, and the bottom edge 41 of the package 4 is coplanar with the bottom surface 12 of the sensing chip 1 of the semi-finished product M.

The inverted wiring step S150: as shown in fig. 4, the semi-finished product M and the package 4 formed on the outer side thereof are inverted, and the reset circuit layer 5 is formed on the bottom edge 41 of the package 4 and the bottom surface 12 of the sensing chip 1 which are coplanar. The external contacts 52 of the reset circuit layer 5 are electrically coupled to the internal contacts 121, respectively.

The ball mounting step S170: as shown in fig. 5, a plurality of solder balls 6 are fixed to a plurality of outer contacts 52 of the reset circuit layer 5, respectively.

[ example two ]

As shown in FIG. 6, which is a second embodiment of the present invention, the present embodiment is similar to the first embodiment, so the same points (e.g., the sensing chip 1, the reset circuit layer 5, and the plurality of solder balls 6) in the two embodiments are not repeated, and the differences between the two embodiments are described as follows:

in this embodiment, the outer edge 13 of the sensing chip 1, the outer edge 21 of the ring support 2, and the outer edge 33 of the light-transmitting member 3 are disposed in a coplanar manner, and the package 4 is a molded package only, and the top edge of the package 4 is coplanar with the first surface 31 of the light-transmitting member 3.

More specifically, the light-transmitting member 3 is transparent glass and includes a plate-shaped portion 3a, a support portion 3b having a ring shape, and a bonding layer 3c bonding the plate-shaped portion 3a and the support portion 3 b. Wherein the surface of the plate-like portion 3a remote from the support portion 3b (e.g., the top surface of the plate-like portion 3a in fig. 6) is defined as the first surface 31, and the surface of the support portion 3b remote from the plate-like portion 3a (e.g., the bottom surface of the support portion 3b in fig. 6) is defined as the second surface 32. The shape of the supporting portion 3b substantially corresponds to the shape of the ring support 2, and the bonding layer 3c is a glass glue layer, an epoxy resin layer, or a welding layer.

In addition, in other embodiments not shown in the present disclosure, the bonding layer 3c may be omitted from the light-transmitting member 3; that is, the plate-shaped portion 3a and the support portion 3b of the light transmitting member 3 may be formed integrally as a single piece.

[ technical effects of embodiments of the present invention ]

In summary, the chip-scale sensor package structure disclosed in the embodiments of the invention is structurally improved (for example, the reset circuit layer is directly formed on the bottom surface of the sensing chip and the bottom edge of the package body), so that the outer edge of the light-transmitting element can be covered by the package body, and the bonding strength of the light-transmitting element in the chip-scale sensor package structure is further improved, thereby preventing the chip-scale sensor package structure from delaminating during the temperature cycling reliability test.

Furthermore, in the chip scale sensor package structure disclosed in the embodiment of the present invention, the bottom surface of the sensing chip is coplanar with the bottom edge of the package body, so as to facilitate the formation of the reset circuit layer; the packaging body is filled in the annular groove formed by the sensing chip, the annular supporting body and the light-transmitting piece in a surrounding mode, and therefore the bonding strength of the light-transmitting piece in the chip-scale sensor packaging structure is further improved.

In addition, in the chip scale sensor package structure disclosed in the embodiment of the invention, the light-transmitting member may be composed of a plate-shaped portion and a supporting portion, so that the enclosed space is enlarged, and the vertical distance between the sensing region of the sensing chip and the light-transmitting member is increased, thereby reducing the influence of stains (bleish) attached to the plate-shaped portion on the sensing result of the sensing chip.

The disclosure is only a preferred embodiment of the invention and is not intended to limit the scope of the invention, so that all equivalent technical changes made by using the contents of the specification and drawings are included in the scope of the invention.