CN208127212U - A kind of encapsulating structure of image sensing chip - Google Patents
A kind of encapsulating structure of image sensing chip Download PDFInfo
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- CN208127212U CN208127212U CN201820575427.8U CN201820575427U CN208127212U CN 208127212 U CN208127212 U CN 208127212U CN 201820575427 U CN201820575427 U CN 201820575427U CN 208127212 U CN208127212 U CN 208127212U
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Abstract
This application discloses a kind of encapsulating structures of image sensing chip, wherein the encapsulating structure includes：Image sensing chip, image sensing chip include opposite first surface and second surface, and first surface includes photosensitive region and non-photo-sensing region；Deviate from the substrate of second surface side positioned at image sensing chip, substrate has opening, and opening exposes photosensitive region；Deviate from the euphotic cover plate of image sensing chip-side, euphotic cover plate covering opening positioned at substrate；There is light-shielding structure towards and/or away from one side surface of substrate positioned at euphotic cover plate, light-shielding structure covers the periphery of opening.The light-shielding structure can play the role of being irradiated to substrate to incident ray to be blocked towards opening sidewalls, the abnormal phenomenon for light convergence occur due to the pixel region of image sensing chip is reduced to realize, caused by image sensing chip output image in formed solar flare phenomenon probability, improve the image quality of image sensing chip.
Description
Technical Field
The application relates to the technical field of image acquisition devices, in particular to a packaging structure of an image sensing chip.
Background
The image sensing chip is an electronic device capable of sensing external light and converting the external light into an electrical signal. The image sensor chip is usually manufactured by a semiconductor manufacturing process. After the image sensing chip is manufactured, a series of packaging processes are performed on the image sensing chip to form a packaged structure, so that the packaged structure is used in electronic equipment such as a digital camera and a digital video camera.
The packaging structure of the image sensing chip in the prior art mainly comprises a fan-out (Fanout) substrate, a transparent cover plate and the like, wherein the fan-out substrate comprises an opening, a pixel area of the image sensing chip is arranged towards the opening, so that light can irradiate on the pixel area through the opening, the transparent cover plate is arranged on one side of the opening, which deviates from the image sensing chip, and the transparent cover plate is used for protecting the pixel sensing chip.
However, in a specific use process, due to the reflection phenomenon that the opening side of the fan-out substrate faces the light, the abnormal phenomenon of light convergence is easily caused in a part of the pixel area of the image sensing chip, and a Flare (Flare) phenomenon is formed in an image output by the image sensing chip in the area where the light converges, so that the imaging quality of the image sensing chip is reduced.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the present application provides a package structure of an image sensor chip, so as to reduce the possibility of an abnormal phenomenon that light is converged in a pixel area of the image sensor chip due to a reflection phenomenon that a side of an opening of a substrate faces light, thereby reducing the probability of a flare phenomenon formed in an image output by the image sensor chip due to the area where the light is converged, and improving the imaging quality of the image sensor chip.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
a package structure of an image sensing chip comprises:
the image sensing chip comprises a first surface and a second surface which are opposite, wherein the first surface comprises a photosensitive area and a non-photosensitive area;
the substrate is positioned on one side, away from the second surface, of the image sensing chip and provided with an opening, and the photosensitive area is exposed from the opening;
the light-transmitting cover plate is positioned on one side, away from the image sensing chip, of the substrate, and the light-transmitting cover plate covers the opening;
and a shading structure is arranged on the surface of one side, facing to and/or departing from the substrate, of the light-transmitting cover plate, and the shading structure covers the periphery of the opening.
Optionally, the method further includes: the lens module is arranged on the substrate, covers the opening and forms an optical cavity together with the substrate and the image sensing chip.
Optionally, the light shielding structure is located on a surface of one side of the light-transmitting cover plate facing the substrate.
Optionally, the width of the light shielding structure covering the opening satisfies a first preset formula;
the first preset formula is as follows:α is the maximum light entrance angle of the lens module, d1And l is the width of the cover plate, and l is the width of the shading structure covering the opening.
Optionally, the light shielding structure is located on a surface of the light-transmitting cover plate on a side away from the substrate.
Optionally, the width of the light shielding structure covering the opening satisfies a second preset formula;
the second preset formula is as follows:wherein d is1Is the width of the cover plate, d2The width of the light-transmitting cover plate is α, the maximum light entrance angle of the lens module is α, n is the refractive index of the light-transmitting cover plate relative to the vacuum medium, and l is the width of the light-shielding structure covering the opening.
Optionally, the light shielding structure is a black glue film layer.
Optionally, the light shielding structure is a light absorbing coating.
Optionally, the surface of the sidewall of the substrate facing the opening is a rough surface or coated with a diffuse reflection coating.
Optionally, a surface of a sidewall of the substrate facing the opening is coated with a light absorbing coating.
Optionally, a wiring line and a contact end connected to the wiring line are disposed on the substrate, and the wiring line is used for electrically connecting to an external circuit;
the photosensitive area of the image sensing chip is provided with a plurality of pixel points for collecting image information and a plurality of first welding pads connected with the pixel points, and the first welding pads are electrically connected with the contact ends.
Optionally, the first pad is electrically connected to the contact end through a conductive adhesive or a soldering structure.
Optionally, the method further includes: and the sealing resin is positioned on the first welding pads and the wiring lines and faces the side wall of the opening.
Optionally, an external terminal electrically connected to the wiring line is further disposed on a surface of one side of the substrate facing the image sensing chip, and the external terminal is used for electrically connecting to the external circuit.
Optionally, the method further includes:
and an insulating film covering an exposed surface of the wiring line.
Optionally, the method further includes:
and the light source compensation device is arranged on the surface of one side of the substrate, which is far away from the image sensing chip.
Optionally, the wiring lines include a first interconnection line and a second interconnection line insulated from each other; wherein,
the first interconnection line is used for electrically connecting the pixel point with an external circuit;
the second interconnection line is used for electrically connecting the light source compensation device with an external circuit.
Optionally, the light-transmitting cover plate is a tempered glass cover plate or an acrylic cover plate.
Optionally, the light-transmitting cover plate is an optical glass cover plate;
the optical glass cover plate is optically transparent to at least one range of light wavelengths.
Optionally, the surface of the optical glass cover plate is further provided with an optical coating;
the optical coating at least has one of functions of antireflection, permeability increasing, infrared cut-off and visible light filtering.
It can be seen from the above technical scheme that the embodiment of the present application provides an image sensor chip's packaging structure, shading structure among this packaging structure is located printing opacity apron orientation and/or deviates from base plate side surface, and cover the open-ended periphery of base plate, in order to play the effect of sheltering from that incident light shines the base plate towards the opening lateral wall, thereby realized reducing because the reflection of base plate opening side face light, and make image sensor chip's pixel region appear the unusual phenomenon's that light assembles possibility, reduced because the probability that the region that these light assembles formed the flare phenomenon in the image of image sensor chip output, image sensor chip's imaging quality has been promoted.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view illustrating a package structure of an image sensor chip according to an embodiment of the present disclosure;
fig. 2 is an enlarged schematic structural view of an M1 area of the package structure shown in fig. 1;
FIG. 3 is a top view of the package structure shown in FIG. 1 in a direction opposite to the Z-direction;
FIG. 4 is a top view of the package structure shown in FIG. 1 in the Z-direction;
fig. 5 is a schematic cross-sectional view illustrating a package structure of an image sensor chip according to another embodiment of the present disclosure;
fig. 6 is an enlarged schematic structural view of an M2 area of the package structure shown in fig. 2;
fig. 7 is a schematic cross-sectional view illustrating a package structure of an image sensor chip according to another embodiment of the present application;
fig. 8-13 are schematic flow charts illustrating a method for packaging an image sensor chip according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1 to 4, fig. 1 is a schematic cross-sectional structure diagram of a package structure of an image sensor chip according to an embodiment of the present disclosure, fig. 2 is an enlarged schematic view of an area M1 of the package structure shown in fig. 1, fig. 3 is a top view of the package structure shown in fig. 1 in a direction opposite to a Z direction, fig. 4 is a top view of the package structure shown in fig. 1 in the Z direction, coordinate systems in the drawings provided in the present disclosure are right-handed coordinate systems established in a direction perpendicular to the image sensor chip and pointing to a substrate as the Z-axis forward direction, an X axis, a Y axis and a Z axis are perpendicular to each other, and we define the Z-axis extending direction as a first direction, the X-axis extending direction as a second direction and the Y-axis extending direction as a third direction.
The packaging structure comprises: image sensor chip 11, image sensor chip 11 includes relative first surface and second surface, the first surface includes photosensitive area C and non-photosensitive area D, be provided with a plurality of pixel 12 that are used for gathering image information on the photosensitive area C, be provided with on the non-photosensitive area D with a plurality of the first pad 13 that pixel 12 is connected.
The substrate 20 is located on a side of the image sensing chip 11 away from the second surface, for convenience of description, the substrate 20 is divided into a first area a and a second area B surrounding the first area a, the substrate 20 has an opening K, the opening K is located in the first area a and exposes the photosensitive area C, and the substrate 20 is provided with a wiring line 16 and a contact end connected with the wiring line 16. The wiring lines 16 include first interconnection lines for electrically connecting the pixel sites 12 with an external circuit. And the external circuit performs image processing according to the image information acquired by the pixel points 12. The first pad 13 is electrically connected to the contact point. Optionally, the first pad 13 is electrically connected to the contact end through a conductive adhesive or a soldering structure. When the first bonding pad 13 is electrically connected to the contact terminal through a conductive adhesive, referring to fig. 7, fig. 7 is a schematic cross-sectional structure of a package structure of an image sensing chip according to an embodiment of the present application, in which the conductive adhesive 14' is disposed on a periphery of the image sensing chip 11, so that the image sensing chip 11 is bonded and fixed to the substrate 20 through the conductive adhesive, and in a direction perpendicular to the substrate 20, the conductive adhesive surrounds all the pixel points 12 and does not overlap with the pixel points 12.
When the first pad 13 is electrically connected to the contact terminal through a soldering structure, referring to fig. 1, the soldering structure is a soldering bump 14 located on a side of the first pad 13 away from the substrate 20. In addition, optionally, still referring to fig. 1, the package structure further includes: the sealing resin 15 is located the first welding pad 13 reaches the routing circuit 16 orientation the sealing resin 15 of opening K side, sealing resin 15 is in orthographic projection on the base plate 20 is located non-photosensitive region D, and surrounds all pixel 12, sealing resin 15 can avoid external steam, impurity to pass through in the gap between first welding pad 13 and welded structure or the conducting resin enters into opening K, and causes harmful effects to the imaging effect and the life of sensing chip. Also, to protect the routing lines 16, still referring to fig. 1, the package structure further includes: and an insulating film 21 covering an exposed surface of the wiring line 16, wherein the insulating film 21 can prevent the wiring line 16 from being corroded or oxidized by external moisture and the like, and improve the stability of the packaging structure.
And the light-transmitting cover plate 19 is positioned on one side of the substrate 20, which is far away from the image sensing chip 11, and the light-transmitting cover plate 19 covers the opening K. Optionally, the light-transmitting cover plate 19 may be a tempered glass cover plate or an acrylic cover plate, and may also be an optical glass cover plate; wherein the optical glass cover plate is optically transparent to at least one range of light wavelengths. In some embodiments of the present application, in order to enrich the optical performance of the optical glass cover plate, the surface of the optical glass cover plate may also be provided with an optical coating; the optical coating at least has one of functions of antireflection, permeability increasing, infrared cut-off and visible light filtering. The antireflection function and the antireflection function mainly refer to functions of reducing or eliminating reflected light on the surface of the optical glass cover plate, so that the light transmission quantity of the optical glass cover plate is increased, and stray light of the packaging structure is reduced or eliminated; the infrared cut-off function is a function of filtering infrared wave bands and can prevent unnecessary heat from burning the optical glass cover plate; the visible light filtering function refers to a function of filtering a visible light portion in an incident light ray, so that the image sensing chip 11 with the packaging structure can be applied to the field of infrared imaging.
The light shielding structure 22 is located on a side surface of the light-transmitting cover plate 19 facing and/or away from the substrate 20, and the light shielding structure 22 covers a periphery of the opening K.
Normally, the surface of the light-transmitting cover plate 19 facing to and facing away from the substrate 20 only needs to have the light-shielding structure 22 on one side to block the light incident on the side of the substrate 20 facing to the opening K, but in some embodiments of the present application, the light-shielding structure 22 is disposed on both sides of the surface of the light-transmitting cover plate 19 facing to and facing away from the substrate 20. The present application does not limit this, which is determined by the actual situation.
In order to ensure the imaging quality of the package structure in a weak light environment, still referring to fig. 1, the package structure provided in the embodiment of the present application further includes: and the light source compensation device 18 is arranged on the surface of the substrate 20, which is far away from the image sensing chip 11. Referring to fig. 3, the orthographic projection of the light source compensation device 18 on the substrate 20 is located in the second area B of the substrate 20, and does not overlap with the orthographic projection of the photosensitive area C of the image sensing chip 11 on the substrate 20. Optionally, the light source compensation device 18 is an LED device. The operation of the light source compensation means 18 may be controlled by an external circuit. The wiring line 16 further includes a second interconnection line for electrically connecting the light source compensation device 18 with an external circuit. The second interconnection line and the first interconnection line are insulated from each other.
In the embodiment of the present application, since the opening K of the substrate 20 exposes the photosensitive region C, the substrate 20 may be made of a non-transparent material, and a light-transmitting region is not required. Specifically, the substrate 20 may be a PCB substrate, an opaque plastic substrate, or a semiconductor substrate.
The substrate 20 may have a single-layer or multi-layer stacked structure, and the corresponding first interconnection and/or second interconnection may also have a single-layer or multi-layer stacked structure. When the substrate 20 is a PCB substrate or an opaque plastic substrate, and the first interconnection line and the second interconnection line are a multi-layer stacked structure, the first interconnection line and/or the second interconnection line may include a plurality of metal line layers and a metal plug or via connection structure interconnecting metal line layers of adjacent layers.
When the substrate 20 is a semiconductor substrate, the first interconnection line and/or the second interconnection line may include a via interconnection structure penetrating the semiconductor substrate and a rewiring metal line layer electrically connected to the via interconnection structure on the first surface and/or the second surface of the semiconductor substrate.
The number of the first interconnection lines is multiple (more than or equal to 2), the number of the second interconnection lines is multiple (more than or equal to 2), and different first interconnection lines and/or second interconnection lines are isolated and insulated from each other. The number of the first interconnection lines and the second interconnection lines and the wiring mode are set according to electronic components which need to be connected with an external circuit.
Referring to fig. 1 and 4, an external terminal 17 electrically connected to the wiring line 16 is further disposed on a surface of the substrate 20 facing the image sensing chip 11, and the external terminal 17 is used for electrically connecting to the external circuit, so that the external circuit is electrically connected to the pixel 12 in the image sensing chip 11. Referring to fig. 4, the orthographic projection of the external connection terminal 17 on the substrate 20 is located at the second region B of the substrate 20, and does not overlap with the image sensing chip 11.
In order to ensure that the light shielding structure 22 can better block the substrate 20 from reflecting light toward the side of the opening K toward the image sensor chip 11, the position of the light shielding structure 22 is further defined in some embodiments below.
Referring to fig. 1, fig. 2, fig. 5 and fig. 6, fig. 5 is a schematic cross-sectional structure diagram of a package structure of an image sensor chip according to an embodiment of the present disclosure, and fig. 6 is an enlarged schematic view of an area M2 of the package structure shown in fig. 5.
In the embodiment shown in fig. 1 and 2, the light shielding structure 22 is located on a surface of the light-transmitting cover plate 19 facing the substrate 20.
In order to enable the light shielding structure 22 on the side of the light-transmitting cover plate 19 facing the substrate 20 to completely prevent incident light from irradiating the side of the substrate 20 facing the opening K, the width l of the light shielding structure 22 covering the opening K satisfies a first preset formula;
the first preset formula is as follows:α is the maximum light entrance angle of the lens module, d1The width of the cover plate is l, and the width of the light shielding structure 22 covering the opening K is l.
Referring to fig. 2, in the embodiment shown in fig. 2, since the light shielding structure 22 is located on the side of the transparent cover 19 facing the substrate 20, the influence of the transparent cover 19 on the refraction of the incident light is not considered, because the incident angle of the incident light is not changed after the incident light exits through the transparent cover. As can be seen from fig. 2, when the light shielding structure 22 covers the opening K, the width l is equal toDuring the process, the incident light passing through the edge of the light shielding structure 22 just grazes the side of the substrate 20 facing the opening K near the lower edge of the image sensor chip 11, and is not reflected by the side of the substrate 20 facing the opening K. Therefore, when the width of the light shielding structure 22 covering the opening K satisfies the first preset formula, the light shielding structure 22 can completely prevent the incident light from being reflected by the substrate 20 toward the sidewall of the opening K to form flare in the image sensing chip 11.
In the embodiment shown in fig. 5 and 6, the light shielding structure 22 is located on a surface of the light-transmissive cover plate 19 facing away from the substrate 20.
Similarly, in order to enable the light shielding structure 22 on the side of the light-transmitting cover plate 19 away from the substrate 20 to completely prevent incident light from irradiating the side of the substrate 20 facing the opening K, the width of the light shielding structure 22 covering the opening K satisfies a second preset formula;
the second preset formula is as follows:wherein d is1Is the width of the cover plate, d2The width of the light-transmitting cover plate 19 is α, which is the maximum light entrance angle of the lens module, n is the refractive index of the light-transmitting cover plate 19 relative to the vacuum medium, and l is the width of the light-shielding structure 22 covering the opening K.
In the embodiment shown in fig. 5 and 6, since the light shielding structure 22 is located on the side of the light-transmitting cover plate 19 facing away from the substrate 20, the image generated by the refraction of the incident light by the light-transmitting cover plate 19 needs to be considered. As shown in fig. 6, the distance that the incident light beam incident on the edge of the light shielding structure 22 close to the opening K moves in the direction (second direction) parallel to the substrate 20 plane in the transparent cover plate 19 calculated according to the law of refraction (assuming that the refractive index of the environment where the package structure is located is the vacuum refractive index 1) is as followsAfter exiting through the transparent cover plate 19, the substrate 20 moves in the second direction by a distance equal to the distance between the edge of the sidewall of the opening K close to the image sensor chip 11 and the edgeTherefore, the width of the light shielding structure 22 covering the opening K is equal toIn this case, the light shielding structure 22 can completely shield the substrate 20 from the incident light toward the sidewall of the opening K.
Optionally, the light shielding structure 22 may be a black glue film layer, and may also be a light absorbing coating. The specific material type of the light shielding structure 22 is not limited in this application, and is determined according to the actual situation.
In order to further avoid the flare formed in the photosensitive area C of the image sensor chip 11 due to the reflection of the side of the substrate 20 facing the light ray, in an embodiment of the present application, the side of the substrate 20 facing the opening K may be set to be a rough surface, and may be coated with a diffuse reflection coating on an inclined slope to avoid the mirror reflection of the side of the substrate 20 facing the incident light ray, so as to avoid the possibility of the flare formed in the photosensitive area C of the image sensor chip 11 due to the mirror reflection of the side of the substrate 20 facing the light ray.
In addition, in another embodiment of the present application, the side surface of the substrate 20 facing the opening K may also absorb incident light irradiated on the side surface by applying a light-absorbing coating, so as to reduce the reflection amount of the side surface for the incident light, thereby reducing the possibility of flare being formed in the photosensitive area C of the image sensor chip 11 due to the reflection of the light by the side surface of the substrate 20 facing the opening K.
As can be seen from the above description, the light shielding structure 22 in the package structure provided in the embodiment of the present application is located on a side surface of the light-transmitting cover plate 19 facing and/or away from the substrate 20, and covers a periphery of the opening K of the substrate 20, so as to play a role of shielding incident light from the substrate 20 toward a sidewall of the opening K, thereby reducing a possibility of an abnormal phenomenon of light convergence in a pixel area of the image sensor chip 11 due to reflection of light by a side surface of the opening K of the substrate 20, reducing a probability of a flare phenomenon formed in an image output by the image sensor chip 11 due to the area where the light converges, and improving an imaging quality of the image sensor chip 11.
Based on the foregoing embodiment of the package structure, correspondingly, an embodiment of the present application further provides a method for packaging an image sensor chip 11, where the method for packaging is shown in fig. 8 to 13, and fig. 8 to 13 are schematic flow diagrams of the method for packaging provided by the embodiment of the present application, and the method for packaging includes:
s101: as shown in fig. 8 and 9, a sheet material 31 is provided, where the sheet material 31 includes a plurality of encapsulation areas 32 arranged in an array, a cutting street 30 is provided between adjacent encapsulation areas 32, and the encapsulation areas 32 include a first area a and a second area B surrounding the first area a;
fig. 8 is a schematic top view of the plate 31, and in the subsequent step, after cutting, the plate 31 is divided into a plurality of substrates 20. Fig. 9 is a schematic cross-sectional view taken along line AA' of fig. 8, wherein the encapsulation region 32 includes a first region a and a second region B surrounding the first region a; the first region a is used to form an opening K in a subsequent process.
The package region 32 is provided with a wiring line 16 and a contact terminal electrically connected to the wiring line 16; the wiring lines 16 include first interconnection lines for electrically connecting the pixel sites 12 with an external circuit. And the external circuit performs image processing according to the image information acquired by the pixel points 12. The wiring lines 16 and the contact terminals are not shown in fig. 8.
S102: as shown in fig. 10, an opening K penetrating the plate material 31 is formed in the first region a of each of the encapsulation regions 32;
the opening K may be formed by using a laser, a photolithography process, a wet etching process, a mechanical grinding process, or any other similar method. In an embodiment of the present application, firstly, a photoresist is coated on the surface of the board 31, then a mask is disposed on the surface of the photoresist, the photoresist is patterned by using the mask as a mask, and the board 31 is subjected to photolithography by using the remaining patterned photoresist as a mask, so as to form an opening K penetrating through the board 31 in the first area a of each package region 32.
S103: as shown in fig. 11, an image sensor chip 11 is fixed on each of the package regions 32, and a photosensitive area C of the image sensor chip 11 faces the opening K;
the image sensing chip 11 comprises a first surface and a second surface which are opposite, the first surface comprises a photosensitive area C and a non-photosensitive area D, and the photosensitive area C is provided with a plurality of pixel points 12 for collecting image information and a plurality of first welding pads 13 connected with the pixel points 12.
S104: as shown in fig. 12, a light-transmitting cover plate 19 is fixed on a side of each opening K facing away from the image sensing chip 11, a light-shielding structure 22 is disposed on a surface of the side of the light-transmitting cover plate 19 facing and/or facing away from the substrate 20, and the light-shielding structure 22 covers a periphery of the opening K.
In general, in order to optimize the performance of the image sensor chip 11 or improve the reliability of the image sensor chip 11, in other trials of the present application, the packaging method includes:
s201: providing an initial plate 31, and forming cutting channels 30 on the initial plate 31 to form a plurality of packaging areas 32 arranged in an array, wherein the packaging areas 32 comprise a first area A and a second area B surrounding the first area A;
s202: in the second region B, a wiring line 16 and a contact terminal electrically connected to the wiring line 16 are formed to form a plate material 31, and the wiring line 16 is used for electrical connection with an external circuit.
Since the substrate 20 is cut from the plate 31, the material of the plate 31 is the same as the material of the substrate 20, and specific reference is made to the description in the package structure, which is not repeated herein.
S203: an opening K is formed through the plate material 31 in the first region a of each of the encapsulation regions 32.
S204: coating a conductive adhesive on the periphery of each package region 32, adhering an image sensing chip 11 to the conductive adhesive, and performing hot-pressing curing on the conductive adhesive to fix the image sensing chip 11 to the substrate 20 through the conductive adhesive and electrically connect the first bonding pad 13 of the image sensing chip 11 to the contact terminal;
or
Fixing an image sensing chip 11 on each of the package regions 32 by a soldering structure, so that the image sensing chip 11 is fixed to the substrate 20 by the soldering structure, and the first pads 13 of the image sensing chip 11 are electrically connected to the contact terminals;
the first bonding pad 13 is connected to a plurality of pixel points 12 of the image sensor chip 11 for collecting image information. Referring to fig. 12, the welding structure may be a welding projection.
S205: referring to fig. 12, a transparent cover plate 19 is fixed on a side of each opening K facing away from the image sensing chip 11, a light shielding structure 22 is disposed on a surface of the side of the transparent cover plate 19 facing and/or facing away from the substrate 20, and the light shielding structure 22 covers a periphery of the opening K.
Optionally, the light-transmitting cover plate 19 may be a tempered glass cover plate or an acrylic cover plate, and may also be an optical glass cover plate; wherein the optical glass cover plate is optically transparent to at least one range of light wavelengths.
S206: as shown in fig. 13, a sealing resin 15 is formed on the side surface of the first pad 13 and the wiring line 16 facing the opening K. The sealing resin 15 is used to enhance the sealing property of the space where the photosensitive region C is located, thereby preventing the intrusion of external impurities.
S207: a lens module (not shown in the drawings) is disposed on a side of the substrate 20 away from the image sensing chip 11, and the lens module covers the opening K to form an optical cavity with the substrate 20 and the image sensing chip 11.
S208: forming an external connection terminal 17 electrically connected to the wiring line 16 on each of the package regions 32, the external connection terminal 17 being used for electrical connection to the external circuit;
the external terminal 17 and the image sensing chip 11 are located on the same side of the plate 31.
The external terminal 17 is used for electrically connecting with the external circuit, so that the external circuit is electrically connected with the pixel 12 in the image sensing chip 11. The orthographic projection of the external connection terminal 17 on the substrate 20 is located at the position of the second area B of the substrate 20, and is not overlapped with the image sensing chip 11.
S209: a light source compensation device 18 is disposed on a surface of the second region B of each of the package regions 32 facing away from the image sensor chip 11.
The light source compensation device 18 is configured to ensure imaging quality of the packaged image sensing chip 11 in an environment with weak light, and an orthogonal projection of the light source compensation device 18 on the substrate 20 is located in the second area B of the substrate 20 and does not overlap an orthogonal projection of the photosensitive area C of the image sensing chip 11 on the substrate 20. Optionally, the light source compensation device 18 is an LED device. The operation of the light source compensation means 18 may be controlled by an external circuit. The wiring line 16 further includes a second interconnection line for electrically connecting the light source compensation device 18 with an external circuit. The second interconnection line and the first interconnection line are insulated from each other.
S210: the plate 31 is cut along the cutting streets 30 to form a plurality of package structures of the image sensor chips, after the cutting, the plate 31 is divided into a plurality of substrates 20, and each substrate 20 includes one of the package regions 32.
In summary, the embodiment of the present application provides a package structure of an image sensor chip and a packaging method thereof, wherein a light shielding structure 22 in the package structure is located on a side surface of a transparent cover plate 19 facing and/or away from a substrate 20, and covers a periphery of an opening K of the substrate 20 to play a role of shielding incident light from a sidewall of the substrate 20 facing the opening K, so as to reduce a possibility of an abnormal phenomenon of light convergence in a pixel area of the image sensor chip 11 due to reflection of light by a side surface of the opening K of the substrate 20, reduce a probability of a flare phenomenon formed in an image output by the image sensor chip 11 due to a region where the light converges, and improve an imaging quality of the image sensor chip 11.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (20)
1. The utility model provides a packaging structure of image sensing chip which characterized in that includes:
the image sensing chip comprises a first surface and a second surface which are opposite, wherein the first surface comprises a photosensitive area and a non-photosensitive area;
the substrate is positioned on one side, away from the second surface, of the image sensing chip and provided with an opening, and the photosensitive area is exposed from the opening;
the light-transmitting cover plate is positioned on one side, away from the image sensing chip, of the substrate, and the light-transmitting cover plate covers the opening;
and a shading structure is arranged on the surface of one side, facing to and/or departing from the substrate, of the light-transmitting cover plate, and the shading structure covers the periphery of the opening.
2. The package structure of claim 1, further comprising: the lens module is arranged on the substrate, covers the opening and forms an optical cavity together with the substrate and the image sensing chip.
3. The package structure according to claim 2, wherein the light shielding structure is located on a side surface of the light transmissive cover plate facing the substrate.
4. The package structure according to claim 3, wherein a width of the light shielding structure covering the opening satisfies a first predetermined formula;
the first preset formula is as follows:α is the maximum light entrance angle of the lens module, d1And l is the width of the cover plate, and l is the width of the shading structure covering the opening.
5. The package structure according to claim 2, wherein the light shielding structure is located on a side surface of the light transmissive cover plate facing away from the substrate.
6. The package structure according to claim 5, wherein a width of the light shielding structure covering the opening satisfies a second predetermined formula;
the second preset formula is as follows:wherein d is1Is the width of the cover plate, d2The width of the light-transmitting cover plate is α, the maximum light entrance angle of the lens module is α, n is the refractive index of the light-transmitting cover plate relative to the vacuum medium, and l is the width of the light-shielding structure covering the opening.
7. The package structure according to any one of claims 1 to 6, wherein the light shielding structure is a black glue film layer.
8. The encapsulation structure according to any one of claims 1 to 6, wherein the light shielding structure is a light absorbing coating.
9. The package structure according to any one of claims 1 to 6, wherein a surface of a sidewall of the substrate facing the opening is rough or coated with a diffuse reflective coating.
10. An encapsulation structure according to any one of claims 1 to 6, the surface of the side wall of the substrate facing the opening being coated with a light absorbing coating.
11. The package structure according to claim 1, wherein a wiring line and a contact terminal connected to the wiring line are provided on the substrate, the wiring line being for electrical connection with an external circuit;
the photosensitive area of the image sensing chip is provided with a plurality of pixel points for collecting image information and a plurality of first welding pads connected with the pixel points, and the first welding pads are electrically connected with the contact ends.
12. The package structure of claim 11, wherein the first pad is electrically connected to the contact terminal by a conductive paste or a solder structure.
13. The package structure of claim 12, further comprising: and the sealing resin is positioned on the first welding pads and the wiring lines and faces the side wall of the opening.
14. The package structure according to claim 11, wherein a surface of the substrate facing the image sensor chip is further provided with an external terminal electrically connected to the wiring line, and the external terminal is configured to be electrically connected to the external circuit.
15. The package structure of claim 14, further comprising:
and an insulating film covering an exposed surface of the wiring line.
16. The package structure of claim 11, further comprising:
and the light source compensation device is arranged on the surface of one side of the substrate, which is far away from the image sensing chip.
17. The package structure according to claim 16, wherein the wiring lines include first interconnection lines and second interconnection lines insulated from each other; wherein,
the first interconnection line is used for electrically connecting the pixel point with an external circuit;
the second interconnection line is used for electrically connecting the light source compensation device with an external circuit.
18. The package structure of claim 1, wherein the light transmissive cover plate is a tempered glass cover plate or an acrylic cover plate.
19. The package structure of claim 18, wherein the light transmissive cover plate is an optical glass cover plate;
the optical glass cover plate is optically transparent to at least one range of light wavelengths.
20. The package structure of claim 19, wherein the optical glass cover plate surface is further provided with an optical coating;
the optical coating at least has one of functions of antireflection, permeability increasing, infrared cut-off and visible light filtering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820575427.8U CN208127212U (en) | 2018-04-20 | 2018-04-20 | A kind of encapsulating structure of image sensing chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820575427.8U CN208127212U (en) | 2018-04-20 | 2018-04-20 | A kind of encapsulating structure of image sensing chip |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108364970A (en) * | 2018-04-20 | 2018-08-03 | 苏州晶方半导体科技股份有限公司 | A kind of encapsulating structure and its packaging method of image sensing chip |
| CN112309991A (en) * | 2019-07-26 | 2021-02-02 | 华为技术有限公司 | Chip, preparation method thereof and electronic equipment |
| TWI828192B (en) * | 2021-12-21 | 2024-01-01 | 同欣電子工業股份有限公司 | Sensor package structure |
-
2018
- 2018-04-20 CN CN201820575427.8U patent/CN208127212U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108364970A (en) * | 2018-04-20 | 2018-08-03 | 苏州晶方半导体科技股份有限公司 | A kind of encapsulating structure and its packaging method of image sensing chip |
| CN112309991A (en) * | 2019-07-26 | 2021-02-02 | 华为技术有限公司 | Chip, preparation method thereof and electronic equipment |
| TWI828192B (en) * | 2021-12-21 | 2024-01-01 | 同欣電子工業股份有限公司 | Sensor package structure |
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