KR20140131266A - Fingerprint sensor module, portable electronic device having the same, and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a fingerprint sensor module with excellent sensing sensitivity, a mobile electronic device including the fingerprint sensor module, and a manufacturing method thereof. The fingerprint sensor module according to an embodiment of the present invention includes; a fingerprint sensor; and a bracket which mounts the fingerprint sensor. The fingerprint sensor includes: a sensing unit which is formed on a substrate to receive the difference between electric signals of the recessed and protruding ribs of a fingerprint on top of the substrate; and a sensor circuit unit sensing and processing the fingerprint image. The bracket includes a cover layer formed to cover the upper surface of the sensing unit, and the cover layer comprises a ferroelectric.

Description

TECHNICAL FIELD [0001] The present invention relates to a fingerprint sensor module, a portable electronic device having the fingerprint sensor module, and a method of manufacturing the fingerprint sensor module.

The present invention relates to a fingerprint sensor module, a portable electronic device having the fingerprint sensor module, and a method of manufacturing the same. More particularly, the present invention relates to a fingerprint sensor module having excellent sensing sensitivity, a portable electronic device having the fingerprint sensor module and a method of manufacturing the same.

BACKGROUND ART [0002] Recently, with the public's attention focused on portable electronic devices including smartphones and tablet PCs, research and development on related technical fields are being actively conducted.

In many cases, a portable electronic device incorporates a touch screen integrated with a display as a display device as one of input devices for receiving a specific command from a user. The portable electronic device may also include various function keys or soft keys as an input device other than a touch screen.

These function keys or soft keys may act as home keys, for example, to exit a running app and return to the home screen, or to return the user interface to a previous layer, And can operate as a menu key for calling up a write menu. In addition, these function keys or soft keys can be implemented as physical buttons. Such a function key or a soft key may be realized by a method of sensing the capacitance of a conductor, a method of sensing an electromagnetic wave of an electromagnetic pen, or a hybrid method in which both of these methods are implemented.

Meanwhile, as the use of smartphones has rapidly expanded to services requiring security, there is an increasing tendency to install fingerprint sensors on smart phones. The fingerprint sensor may be integrated into a physical function key.

The fingerprint sensor is a sensor for detecting the fingerprint of a human being. By performing a user registration or authentication procedure through a fingerprint sensor, data stored in the portable electronic device can be protected and a security accident can be prevented in advance.

Meanwhile, in order to mount a fingerprint sensor on various electronic devices, a fingerprint sensor is manufactured in the form of a module including peripheral parts and structures. In order to match the color of the electronic device on which the fingerprint sensor module is mounted with the color of the fingerprint sensor , Or for other reasons, it is necessary to implement color on a fingerprint sensor base material that includes a fingerprint sensor.

For color implementation on the base material of the fingerprint sensor, conventionally, a method of coating using a color paint and depositing an ultraviolet (UV) curing agent has been used. However, when color is implemented on the base material of the fingerprint sensor by the conventional method, there arises a restriction that the interlayer structure and the thickness of the coating film must be properly ensured. If the coating film is not formed to have a sufficient thickness, it is not only difficult to implement color, but also increases the possibility of causing surface contamination, scratching, scratching, and the like on the fingerprint sensor. These damages adversely affect the image of the fingerprint sensed by the fingerprint sensor.

In addition, in the case of a fingerprint sensor, in particular, an electrostatic-type fingerprint sensor, a change occurs in the operation of the fingerprint sensor depending on the thickness of the film on the base material of the fingerprint sensor. Particularly, as the thickness of the coating on the base material of the fingerprint sensor increases, the sensing response characteristic of the fingerprint sensor deteriorates, so that the thickness of the coating film that implements the color is limited.

Recently, a fingerprint sensor module designed by a COF (Chip-On-Film) and a BGA (Ball Grid Array) method has been developed in order to manufacture a fingerprint sensor module in a portable device at low cost. In this fingerprint sensor module, the fingerprint detection IC is separated from the sensing area.

The fingerprint sensor module includes a fingerprint sensor and a bracket or a substrate on which the fingerprint sensor is fixed. Therefore, a process of combining a fingerprint sensor and a bracket that can increase process efficiency and productivity is required, and a processing process for the bracket is also required to increase the sensing sensitivity.

That is, while the thickness from the sensing area of the fingerprint sensor to the final cover contacting the user's finger is such that the thickness does not affect the function (e.g., fingerprint sensing sensitivity) of the electronic device, There is a need for a fingerprint sensor module having no fingerprint sensor module, a portable electronic device including the fingerprint sensor module, and a manufacturing method thereof.

In order to solve the above problems, the present invention provides a fingerprint sensor module having excellent sensing sensitivity while preventing external defects or breakage, a portable electronic device having the same, and a method of manufacturing the same.

According to an aspect of the present invention, there is provided a fingerprint sensor module including a fingerprint sensor and a bracket for seating the fingerprint sensor, wherein the fingerprint sensor includes a fingerprint sensor A sensing unit formed on the substrate to receive a difference of electrical signals of the bone, and a sensor circuit unit for sensing and processing a fingerprint image, wherein the bracket has a cover layer formed to cover an upper surface of the sensing unit, Wherein the cover layer includes a ferroelectric substance.

In one embodiment of the present invention, the ferroelectric may be mixed with the cover layer in the form of a powder or a liquid.

In an embodiment of the present invention, the bracket may be implemented with a ferroelectric material.

In an embodiment of the present invention, a multi-coating layer including a primer layer, a color coating layer, and a protective coating layer may be further provided on a touch surface formed on an upper surface of the cover layer.

In an embodiment of the present invention, the multi-coating layer may be mixed with a ferroelectric material in the form of powder or liquid.

In an embodiment of the present invention, the multi-coating layer may further include a ferroelectric thin film layer.

In one embodiment of the present invention, a ferroelectric thin film layer may be further provided on a touch surface formed on the upper surface of the cover layer.

In one embodiment of the present invention, the ferroelectric thin film layer may be composed of one ferroelectric thin film, or may include a plurality of ferroelectric thin films and a spacer provided between the plurality of ferroelectric thin films.

In an embodiment of the present invention, the fingerprint sensor may be fixed by filling the bracket with a molding material or by inserting an additional bracket.

According to another aspect of the present invention, there is provided a portable electronic device including the fingerprint sensor module.

According to another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: a) providing a bracket; And b) placing a fingerprint sensor on the bracket, the fingerprint sensor having a sensing part formed on the substrate to receive a difference between an electrical signal of a fingerprint of the finger located on the upper side of the substrate and a sensor circuit part for sensing and processing the fingerprint image Wherein the bracket has a cover layer formed to cover an upper surface of the sensing portion, and the cover layer includes a ferroelectric material.

In one embodiment of the present invention, in the step (a) of providing the bracket, the bracket may be implemented with a ferroelectric material.

In one embodiment of the present invention, the ferroelectric may be mixed with the cover layer in the form of a powder or a liquid.

In one embodiment of the present invention, after the step (b) of placing the fingerprint sensor on the bracket, the touch panel includes a primer layer, a color paint layer, and a protective film layer on the touch surface formed on the upper surface of the cover layer A step of providing a multi-coating layer may be further performed.

In one embodiment of the present invention, in the step of preparing the multi-coating layer, the multi-coating layer may be mixed with a ferroelectric material in the form of powder or liquid.

In one embodiment of the present invention, in the step of providing the multi-coating layer, the multi-coating layer may further include a ferroelectric thin film layer.

In one embodiment of the present invention, after the step (b) of mounting the fingerprint sensor on the bracket, a ferroelectric thin film layer may be further provided on the touch surface formed on the upper surface of the cover layer.

In one embodiment of the present invention, in the step of forming the ferroelectric thin film layer, the ferroelectric thin film layer may be formed of one ferroelectric thin film or may include a plurality of ferroelectric thin films and a spacer provided between the plurality of ferroelectric thin films .

In one embodiment of the present invention, after step (step b) of placing the fingerprint sensor on the bracket, a step of fixing the fingerprint sensor by filling the molding material into the bracket or inserting an additional bracket is performed .

According to an embodiment of the present invention, there can be provided a fingerprint sensor module, a portable electronic device including the fingerprint sensor module, and a method of manufacturing the same, wherein the fingerprint sensor is firmly modularized and the sensing sensitivity is improved. In particular, it is possible to provide a fingerprint sensor module capable of stably supporting a fingerprint sensor designed in a COF or BGA system, a portable electronic device including the fingerprint sensor module, and a method of manufacturing the same.

According to an embodiment of the present invention, there is provided a fingerprint sensor module, a portable electronic device including the fingerprint sensor module, and a method of manufacturing the fingerprint sensor module, in which the upper surface portion of the fingerprint sensor module is efficiently manufactured while the appearance, function, and reliability of the electronic device are not problematic can do.

In addition, according to an embodiment of the present invention, the process can be simplified by placing the fingerprint sensor inside the bracket and fixing the fingerprint sensor using the molding material.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a perspective view illustrating a fingerprint sensor module according to an embodiment of the present invention.
2 is a cross-sectional view taken along the line AA in Fig.
3 is a view illustrating an example of a manufacturing process of a fingerprint sensor module according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a manufacturing process of a fingerprint sensor module according to an embodiment of the present invention.
5 to 7 are cross-sectional views illustrating a fingerprint sensor module according to an embodiment of the present invention.
8 is a schematic view illustrating a process of preparing a ceramic paint by a sol-gel method in a fingerprint sensor module according to an embodiment of the present invention.
9 is a cross-sectional view illustrating a fingerprint sensor module according to an embodiment of the present invention.
10 is an exemplary view illustrating a fingerprint sensor according to an embodiment of the present invention.
11 is a block diagram schematically showing the structure of a fingerprint sensor according to an embodiment of the present invention.
12 is a schematic view illustrating an operation of a fingerprint sensor provided in the fingerprint sensor module according to an embodiment of the present invention.
13 is a schematic view illustrating a fingerprint sensor provided in the fingerprint sensor module according to another embodiment of the present invention.
FIG. 14 is a schematic view illustrating a fingerprint sensor provided in the fingerprint sensor module according to another embodiment of the present invention.
15 is a perspective view illustrating a fingerprint sensor module according to another embodiment of the present invention.
16 is a cross-sectional view illustrating a fingerprint sensor module according to another embodiment of the present invention.
17 is a cross-sectional view illustrating a manufacturing process of a fingerprint sensor module according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view illustrating a fingerprint sensor module according to an embodiment of the present invention, FIG. 2 is an exemplary sectional view taken along the line AA of FIG. 1, and FIG. 3 is a view illustrating a process of manufacturing a fingerprint sensor module according to an exemplary embodiment of the present invention. FIG. 4 is a cross-sectional view illustrating a manufacturing process of a fingerprint sensor module according to an embodiment of the present invention. Referring to FIG.

First, as shown in FIGS. 1 and 2, the fingerprint sensor module 10 includes a fingerprint sensor 200 and a bracket 310.

The fingerprint sensor module 10 may be provided in an electronic device, particularly a portable electronic device. Here, the portable electronic device includes a portable phone, a smart phone, a PDA, a tablet PC, a notebook computer, a portable sound recorder (MP3 player), and the like.

The fingerprint sensor 200 may have a sensing part 210 formed on the substrate 201 using a conductor and a sensor circuit part 220 electrically connected to the sensing part 210. The fingerprint sensor 200 can receive a signal transmitted through a user's finger and sense a fingerprint image.

The bracket 310 is a member that receives and seals the fingerprint sensor 200 and determines the overall shape of the fingerprint sensor module 10 while protecting the fingerprint sensor 200. [ The bracket 310 may be a molded article formed by a mold. The bracket 310 has a cover layer 315 covering the upper portion of the fingerprint sensor 200 and more specifically the sensing portion 210. A touch surface 314 is formed on the upper surface of the cover layer 315. [ That is, the cover layer 315 may be provided between the touch surface 314 and the upper surface of the sensing portion 210. The touch surface 314 is a portion where the user touches, and receives a signal transmitted through the user (more precisely, the user's finger).

The cover layer 315 may include a ferroelectric material 400 capable of increasing the dielectric constant.

The following description will be made with reference to FIG. 3 and FIG. 3 and 4, the bracket 310 has a groove 312 on the inner side, and a groove 312 is formed on the opposite side of the groove 312, (314) are formed.

The bracket 310 has a cover layer 315 between the bottom surface 313 of the groove 312 and the touch surface 314 and the thickness D1 of the cover layer 315 can be formed to be 15 to 30 占 퐉 . Here, the thickness D1 of the cover layer 315 means the thickness measured perpendicularly from the groove 312 to the touch surface 314. [ That is, the cover layer 315 may be the thickness between the touch surface 314 and the upper surface of the sensing portion 210. If the thickness of the cover layer 315 is too thin, the fingerprint sensor 200 can not be stably received. Conversely, if the thickness of the cover layer 315 is too thick, the sensing ability of the fingerprint sensor 200 can be weakened.

The cover layer 315 may include a ferroelectric material 400 capable of increasing the dielectric constant. The ferroelectric thin film layer 410 (see FIG. 5) and the multi-coating layers 500 and 500 (see FIG. 5), which will be described later, can be reduced by reducing the loss of the signal received by the fingerprint sensor in the active state. See Fig. 7) can be implemented more freely.

More specifically, the ferroelectric material 400 is a dielectric material that is an electrically insulating material, and refers to materials that cause positive and negative electric polarization phenomena by themselves without applying a voltage to the ferroelectric material 400. Typical materials include Al2O3, BaTio3 (BTO), SrTio3 (STO), and (Ba, Sr) TiO3 (BST).

The ferroelectric material 400 may be mixed with the bracket 310 in the form of a powder or a liquid to be included in the entire bracket 310 so that the bracket 310 can be realized as an EMC mold including the ferroelectric material 400 have. The EMC mold including the ferroelectric element 400 may be replaced with a COF (Chip On Board) type fingerprint sensor and a BGA (Ball Grid Array) type fingerprint sensor in addition to a COF (Chip On Film) And WLP (Wafer Level Package) type fingerprint sensors.

As described above, the ferroelectric body 400 is preferably included in the cover layer 315, but may be included entirely in the bracket 310 for convenience of the process.

The bracket 310 may be made of any one of nylon and polyamide materials including an epoxy molding compound (EMC), a fluororesin, and 20 to 40% of glass. At this time, the glass can protect the fingerprint sensor from external impact by increasing the strength of the bracket. However, when the ratio of glass is too high, the probability of occurrence of defects in machining becomes high, so it is preferable to add glass in a proportion of 20 to 40%. Further, the fluororesin may be polyfluorinated vinylidene (PVDF) having a high dielectric constant. When the dielectric constant is high, the detection signal is amplified to be able to be recognized from the fingerprint, and free from the thickness in the post-processing.

The sensing unit 210 and the sensor circuit unit 220 of the fingerprint sensor 200 are accommodated in the groove 312. At this time, a predetermined amount of epoxy resin 330 may be injected into the groove 312 as an adhesive in advance.

3 (b) and FIG. 4 (b), the flexible substrate 201 is supported on the step 316 formed at the edge of the groove 312, so that the sensor circuit part (not shown) of the fingerprint sensor 200 220 facing the upper surface. In this process, the fingerprint sensor 200 can be pressed and seated through the same jig 340 as the outline of the fingerprint sensor 200. The flatness of the flexible substrate 201 of the fingerprint sensor 200 can be secured by pressing and fixing the fingerprint sensor 200 on the bracket 310 previously provided.

4 (c), the jig 340 can be removed from the groove 312 after the seating of the fingerprint sensor 200 is completed.

3 (c) to 4 (d) and 4 (d), after removing the jig 340, the groove 312 of the bracket 310 may be filled with the molding material 350 have. As shown in FIG. 3 (b), the sensing portion 210 and the sensor circuit portion 220 are accommodated in the groove 312, and an empty space exists in addition to the accommodated portion. If the empty space is left as it is, the fingerprint sensor 200 can not be fixed and can be moved in the empty space, so that the empty space is filled with the molding material 350. The molding material 350 may be a liquid polymer. For example, any one of an epoxy molding compound, an epoxy resin, and a putty may be used. The epoxy molding compound (EMC) may be a liquid epoxy molding compound (EMC). The epoxy molding compound (EMC) is harder than the PC series formed by general injection and can prevent the tolerance in advance and can improve the flatness. In addition, it has the effect of reducing the chip mark in general injection even after the high temperature process. The molding material 350 can increase the reliability of the fingerprint sensor 200 by bringing the sensing unit 210 into close contact with the bottom surface of the groove 312.

Here, the molding material may be a structure having a predetermined shape. The fingerprint sensor 200 may be fixed in the same manner as the liquid polymer so that the sensing reliability can be improved. The structure may be designed to fit the size of the groove 312 and may be press-fitted or fastened using separate fastening means. An example in which the molding material is used as a structure having a predetermined shape will be described later.

3 (d) shows the bracket 310 of FIG. 3 (c) in an inverted form. The touch surface 314 corresponding to the shape of the groove 312 is protruded from the opposite side of the groove 312 as described above.

5 to 7 are cross-sectional views illustrating a fingerprint sensor module according to an embodiment of the present invention.

5, the ferroelectric thin film layer 410 may be further provided on the touch surface 314 of the bracket 310. [ The ferroelectric thin film layer 410 may be composed of one ferroelectric thin film 411. That is, the ferroelectric thin film layer 410 may be formed of a single ferroelectric thin film.

6, the ferroelectric thin film layer 410 may include a plurality of ferroelectric thin films 411 and a spacer 412 provided between the plurality of ferroelectric thin films 411 . Accordingly, the ferroelectric thin film layer 410 may be formed as a composite structure in which the ferroelectric thin film 411 and the spacer 412 are alternately formed. Here, the spacer 412 may be a thin film or a coating layer, and the coating layer may be formed by coating and mixing in the form of powder, liquid, or the like.

7, a multi-coating layer 500 may be provided on the touch surface 314 of the bracket 310. [

The multi-coating layer 500 may perform various functions such as coloring the fingerprint sensor module 10 or reinforcing the upper surface side strength of the fingerprint sensor module 10.

The multi-coating layer 500 may include a primer layer 502, a color coating layer 503, and a protective coating layer 504. The multi-coating layer 500 may include a primer layer 502, a color coating layer 503, And a passivation layer 504 in this order.

The primer layer 502 is provided on the touch surface 314 to connect the color paint layer 503, and the color paint layer 503 can perform the color implementing function.

The primer layer 502 may be formed to a thickness of 2 to 3 mu m, and the color paint layer 503 may be formed to a thickness of 3 to 5 mu m.

The protective film layer 504 may be a ceramic coating layer including a UV protective film or a ceramic. The protective film layer 504 may be formed to have a thickness of 20 to 22 mu m.

The thickness D2 of the multi-coating layer 500 may be 25 to 30 mu m.

The sum of the thickness D1 of the cover layer 315 and the thickness D2 of the multi-coating layer 500 may be 40 to 60 mu m.

8 is a schematic view illustrating a process of preparing a ceramic paint by a sol-gel method in a fingerprint sensor module according to an embodiment of the present invention.

In order to make the protective film layer 504 a ceramic coating layer, a ceramic coating material is prepared. The ceramic paint can be prepared, for example, by using a sol-gel method in which two or more solutions are stirred to produce a ceramic.

That is, as shown in FIG. 8A, liquids A and B are prepared. Then, the liquid A is shaken up, down, left, and right for a predetermined time (for example, 30 minutes) (FIG. Next, the liquid B is mixed with the liquid A, followed by stirring for a predetermined time (for example, 5 hours) (FIG. 8 (c)). When the two-component ceramic paint is formed in this way, it can be used after being sufficiently shaken before application (spraying) (Fig. 8 (d)). The protective film layer 504 can be formed by spraying the ceramic paint prepared above on the color paint layer 503.

The ceramic coating may be prepared by, for example, a sol-gel method as described above, and a ceramic coating layer may be formed on the color coating layer by using the ceramic coating.

The ceramics have a high permittivity, which reduces the loss of the signal that the image sensor accepts in the active state of the fingerprint sensor. That is, since the ceramic coating layer acts as a dielectric layer, the electric lines of force directed toward the fingerprint sensor 200 through the user's finger (not shown) can be formed more densely. That is, in the fingerprint sensor module 10 according to the embodiment of the present invention, loss of the sensing signal is reduced. In addition, ceramics have high stain resistance such as anti-fingerprint and water repellency. Therefore, it is possible to obtain more clear fingerprint images by reducing image blurring due to surface contamination. In addition, it is possible to realize various colors by blending an inorganic pigment excellent in heat resistance, hiding power and weather resistance in the ceramic paint.

The dielectric constant of the ceramic coating layer may be determined in advance according to the driving frequency of the fingerprint sensor 200. For example, the dielectric constant may be 5 or more. More specifically, when a user's finger touches the fingerprint sensor module 10 or when the user's finger sufficiently approaches the fingerprint sensor module 10 to such a degree that fingerprint recognition is possible, Is received by the sensing unit 210 via the user. When using a ceramic coating layer (i.e., a protective film layer 504) having a dielectric constant suitable for the driving frequency of the sensing portion 210, the signal becomes more concentrated in the ceramic coating layer and is received in the image sensing region. Thus, the loss of the signal is reduced and the operation of the fingerprint sensor 200 is improved.

In the embodiment of the present invention, since the protective film layer 504 of the multi-coating layer 500 is formed of a ceramic coating layer, not only is it possible to guarantee low film thickness, abrasion resistance and heat resistance, It is possible to obtain an effect that the operation is improved.

Further, before the multi-coating layer 500 is provided on the touch surface 314 of the bracket 310, a polishing process for adjusting the thickness of the cover layer 315 of the bracket 310 and increasing the flatness may be further performed. At this time, the polishing process is performed until the thickness of the cover layer 315 of the bracket 310 is 15 to 30 占 퐉, for the fingerprint sensor 200 to be sensed. For example, when the thickness of the cover layer 315 is 100 μm, the cover layer 315 is polished so that the thickness of the cover layer 315 is 15 to 30 μm.

On the other hand, the multi-coating layer 500 may be mixed with a ferroelectric material in the form of powder or liquid. At this time, the ferroelectric may be mixed with at least one of the primer layer 502, the color paint layer 503, and the protective film layer 504.

In addition, the multi-coating layer 500 may further include a ferroelectric thin film layer (not shown). The ferroelectric thin film layer may be provided between any one of the primer layer 502, the color coating layer 503 and the protective film layer 504 constituting the multi-coating layer 500, or separately provided on the lower surface or upper surface of the multi- .

9 is a cross-sectional view illustrating a fingerprint sensor module according to an embodiment of the present invention. As shown in FIG. 9, a metal plate 360 may be further provided on the molding material 350. The metal plate 360 may be provided on the molding material 350 to seal and support a portion where the molding material 350 is exposed and support the fingerprint sensor module 10 to reinforce the strength of the fingerprint sensor module 10. The metal plate 360 may be made of stainless steel.

FIG. 10 is a view illustrating a fingerprint sensor according to an embodiment of the present invention. FIG. 11 is a schematic diagram illustrating a structure of a fingerprint sensor according to an embodiment of the present invention. FIG. 1 is a schematic view illustrating an operation of a fingerprint sensor provided in a fingerprint sensor module according to an exemplary embodiment.

10, the fingerprint sensor 200 may include a flexible substrate 201, a sensing unit 210, a sensor circuit unit 220, and an external interface connection unit 221.

The sensing unit 210 may include a driving electrode and a receiving electrode formed of a conductive material and may be installed inside the substrate 201. The sensing unit 210 may receive a difference between electric signals of a valley and a ridge of a fingerprint of a finger placed on the substrate 201. [

The substrate 201 is made of a flexible printed circuit board (FPCB) of a flexible material, and functions as a substrate of the sensor circuit unit 220 while protecting the driving and receiving electrodes.

The sensor circuit unit 220 is an integrated circuit (IC) integrated with an electronic circuit for sensing a fingerprint image and processing a fingerprint image, and is electrically connected to a driving electrode and a receiving electrode of the sensing unit 210. Since the substrate 201 is made of a flexible printed circuit board (FPCB), the sensor circuit part 220 can be mounted on the lower surface of the substrate 201.

The external interface connecting portion 221 is formed by extending the flexible printed circuit board (FPCB) of the substrate 201 described above. A wiring is formed inside the external interface connecting portion 221, and a connector 223 is formed at one end thereof so as to be connectable to an external interface. The external interface connection unit 221 may be connected to a portable device such as a smart phone. The fingerprint sensor according to an exemplary embodiment of the present invention may have an " I " -shaped structure in which the sensing unit 210 and the external interface connection unit 221 are coupled in the same direction as shown in FIG.

Meanwhile, the fingerprint sensor according to an embodiment of the present invention may have a " T " structure in which the sensing unit and the external interface connection unit are perpendicular to each other. 11, the fingerprint sensor 200 may include a sensing unit 210 provided on a top surface of a substrate 201 and a sensor circuit unit 220 provided on a bottom surface of the substrate 201. [ 11 (a) shows the upper surface of the substrate 201, and FIG. 11 (b) shows the lower surface of the substrate 201. FIG. 11 (c) 220 of the first embodiment of the present invention.

The substrate 201 may be a flexible substrate, and may be formed of, for example, a polymide film, but is not limited thereto.

The sensing unit 210 may include a plurality of driving electrodes 211 and an image receiving electrode 212 formed on a substrate 201. The driving electrode 211 and the image receiving electrode 212 may be formed of conductor lines.

The driving electrode 211 receives the driving signal from the sensor circuit unit 220 and transmits a signal to the image receiving electrode 212 side. The image receiving electrode 212 receives a signal transmitted from the driving electrode 211 via the user (more precisely, the user's finger).

One end of the image receiving electrode 212 located on the upper surface of the substrate 201 is formed to extend in the horizontal direction. A plurality of driving electrodes 211 are formed so as to extend in parallel to each other so as to be perpendicular to the extending direction of the image receiving electrode 212 (see FIG. 11A). The image receiving electrode 212 is electrically connected to the sensor circuit unit 220 on the lower surface of the substrate 201.

One end of the plurality of driving electrodes 211 is spaced apart from the image receiving electrode 212 by a predetermined distance. The other end of the plurality of driving electrodes 211 is electrically connected to the sensor circuit unit 220 on the lower surface of the substrate 201.

12, the driving electrode 211 and the image receiving electrode 212 are spaced apart from each other. The driving signal transmitted from the driving electrode 211 is received by the image receiving electrode 212 through the user U, do. At this time, it is possible to recognize the fingerprint by measuring the change in the electric field according to the presence or absence of the fingerprint bone or fingerprints located on the finger of the user U as a signal.

11 (b) and (c), the sensor circuit unit 220 may have an external interface connection unit 221 electrically connected to the outside.

The fingerprint sensor 200 may be implemented by a chip-on-film (COF) method or a ball grid array (BGA) method. In particular, only the sensing unit 210, that is, the driving electrode 211 and the image receiving electrode 212 are formed on the upper surface of the substrate 201, and the sensor circuit unit 220 connected to the sensing unit 210 is formed on the lower surface of the substrate 201 So that the IC size of the sensor circuit unit 220 can be reduced. As a result, it is possible to eliminate the space limitation in which the sensing unit 210 is installed, and it is possible to make the overall contour compact.

In addition, it is easier to provide the glass on the fingerprint sensor module by not providing the sensor circuit portion on the upper surface of the substrate 201, which is a particularly useful effect in a portable electronic device such as a smart phone.

13, the sensor circuit unit 1220 of the fingerprint sensor 1200 includes a sensing unit 1220 and a sensing unit 1220. The sensing unit 1220 includes a sensing unit 1220, And may be installed at a position substantially apart from the main body 1210. In other words, while the sensor circuit portion 220 (see Figs. 10 and 11) is located inside the bracket 310 (see Fig. 2), the sensor circuit portion 1220 shown in Fig. 13 is provided outside the bracket . This can prevent the impact and heat that may be generated in the combining process of the bracket and the fingerprint sensor 1200 and in the process of fixing the fingerprint sensor 1200 directly to the sensor circuit portion 1220. In addition, since the sensor circuit portion 1220 can be installed on any portion of the substrate 1201, the sensor circuit portion 1220 can be flexibly installed and applied according to the structural characteristics of the portable electronic device to be assembled.

The fingerprint sensor may be formed as a separate type in which the sensor circuit portion and the sensing portion are separated from each other as described above, or may be formed integrally with the sensor circuit portion and the sensing portion.

As shown in FIG. 14, the fingerprint sensor 2200 includes a ball grid array (BGA) 2200, a ball grid array ) Type.

That is, the terminals 2250 may be arranged in a two-dimensional array on the substrate 2201, and the bumps 2221 formed on the lower surface of the sensor circuit portion 2220 may be connected to the terminals 2250. The terminal 2250 and the bump 2221 may be connected by soldering.

The substrate 2201 may be, for example, a printed circuit board (PCB) so as to be electrically connected to the sensor circuit unit 2220 to transmit electrical signal information. Although not shown, a lead frame may be attached to a lower portion of the substrate 2201 by resin injection or surface mounting technology (SMT).

Although the fingerprint sensor has been described as a separation type in the foregoing, the case where the sensor circuit unit and the sensing unit are integrated, and the case where the image receiving unit is a plurality of AREA types are all included in the scope of the present invention.

FIG. 15 is a perspective view of a fingerprint sensor module according to another embodiment of the present invention, FIG. 16 is a cross-sectional view illustrating a fingerprint sensor module according to another embodiment of the present invention, and FIG. FIG. 1 is a cross-sectional view illustrating a manufacturing process of a fingerprint sensor module according to an embodiment of the present invention. In the present embodiment, the fingerprint sensor can be fixed by an additional bracket, and the other configuration is the same as that of the first embodiment, so the description is omitted.

15 to 17, the bracket 3310 accommodates the sensor circuit part 220 of the fingerprint sensor 200 in the first groove 3311 formed on the inner side, and the bracket 3310 is provided at the edge of the first groove 3311 The flexible substrate 201 is supported on the stepped portion 3319 so that the sensing portion 210 of the fingerprint sensor 200 is seated facing the upper surface.

At this time, the fingerprint sensor 200 and the bracket 3310 may be adhered to each other by an epoxy resin or an adhesive tape, and the external interface connection part 221 is exposed to the outside of the bracket 3310 and extended.

The bracket 3310 may be formed with a flange 3312 that includes a penetration portion 3318 that supports the bracket 3310 and can penetrate the external interface connection portion 221. The flange 3312 may be configured integrally or separately with the bracket 3310. [ At this time, the flange 3312 may be formed with a coupling hole (not shown) to which an outer decorative member (not shown) can be coupled. At this time, the penetrating portion 3318 may be formed at a portion of the flange 3312 which abuts the bottom surface of the bracket 3310.

The outer shape of the flange 3312 may be configured to be wider than the rim of the bracket 3310, so that the flange 3312 serves to fix the position so that the subsequent process can be facilitated.

An additional bracket 3320 may be configured to cover the bracket 3310 in a state in which the fingerprint sensor 200 is attached to the bracket 3310 and the external interface connection portion 221 is formed in the penetrating portion 3318. [

The additional bracket 3320 can be designed to fix the external interface connection 221 and facilitate the attachment of the fingerprint sensor module to the mobile device. On the other hand, the additional bracket 3320 may be constructed integrally with the bracket 3310 in the process.

The cover layer 3315 may be formed on the additional bracket 3320 so as to cover the sensing portion 210 of the fingerprint sensor 200. [

Then, after the additional bracket 3320 is formed, a separate polishing process may be further included in the touch surface 3314 of the additional bracket 3320. [ At this time, the polishing process can be performed up to a thickness (15 to 30 mu m) that the fingerprint sensor 200 can sense.

Next, after the polishing process, the multi-coating layer 500 may be formed on the touch surface 3314. [ The multi-coating layer 500 may be formed to a thickness of 25 to 30 mu m.

The bracket 3310, the flange 3312 and the additional bracket 3320 may be made of any one of nylon or polyamide materials including an epoxy molding compound, a fluororesin, and 20-40% Lt; / RTI >

In addition, the cover layer 3315 of the additional bracket 3320 may include the ferroelectric material 400, and the ferroelectric material 400 may be further included in the additional bracket 3320 as a whole.

Further, the additional bracket 3320 may be coupled to the bracket 3310 in a physical manner, or may be coupled by molding, such as insert molding.

The fingerprint sensor module 3010 in which the bracket 3310, the fingerprint sensor 200, and the additional bracket 3320 are combined may be processed on the substrate and separated into individual modules through a sawing process.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

10, 3010: Fingerprint sensor module
200, 1200, 2200: Fingerprint sensor
220, 1220, 2220:
310, 3310: Bracket
312: Home
314, 3314:
315,3315: Cover layer
340: jig
350: Molding material
360: metal plate
400: ferroelectric
410: ferroelectric thin film layer
411: ferroelectric thin film
412: Spacer
500: multi-coating layer
502: primer layer
503: Color paint layer
504:
3320: Additional bracket

Claims (19)

A fingerprint sensor module including a fingerprint sensor and a bracket for seating the fingerprint sensor,
Wherein the fingerprint sensor includes a sensing unit formed on the substrate to receive a difference between an electric signal of a peak and a peak of a fingerprint of a finger located on the upper side of the substrate and a sensor circuit unit for sensing and processing the fingerprint image,
Wherein the bracket has a cover layer formed to cover an upper surface of the sensing unit, and the cover layer includes a ferroelectric. The method according to claim 1,
Wherein the ferroelectric material is mixed with the cover layer in the form of a powder or a liquid. The method according to claim 1,
Wherein the bracket is implemented with a ferroelectric material. The method according to claim 1,
Wherein a multi-coating layer including a primer layer, a color paint layer, and a protective film layer is further provided on a touch surface formed on an upper surface of the cover layer. 5. The method of claim 4,
Wherein the multi-coating layer is mixed with a ferroelectric material in the form of powder or liquid. 5. The method of claim 4,
Wherein the multi-coating layer further comprises a ferroelectric thin film layer. The method according to claim 1,
And a ferroelectric thin film layer is further provided on a touch surface formed on an upper surface of the cover layer. 8. The method of claim 7,
Wherein the ferroelectric thin film layer is constituted by one ferroelectric thin film or comprises a plurality of ferroelectric thin films and a spacer provided between the plurality of ferroelectric thin films. The method according to claim 1,
Wherein the fingerprint sensor is fixed by filling the bracket with a molding material or by inserting an additional bracket. A portable electronic device having a fingerprint sensor module according to any one of claims 1 to 9. a) providing a bracket; And
b) placing a fingerprint sensor on the bracket, the fingerprint sensor having a sensing part formed on the substrate to receive a difference between an electrical signal of a fingerprint of the finger located on the upper side of the substrate and a sensor circuit part for sensing and processing the fingerprint image, Lt; / RTI >
Wherein the bracket has a cover layer formed to cover an upper surface of the sensing unit, and the cover layer includes a ferroelectric material. 12. The method of claim 11,
Wherein the ferroelectric material is mixed with the cover layer in the form of a powder or a liquid. 12. The method of claim 11,
Wherein in the step (a) of providing the bracket, the bracket is embodied as a ferroelectric material. 12. The method of claim 11,
And a step of providing a multi-coating layer including a primer layer, a color coating layer, and a protective layer on the touch surface formed on the upper surface of the cover layer after the step (b) of seating the fingerprint sensor on the bracket And the fingerprint sensor module is mounted on the fingerprint sensor module. 16. The method of claim 15,
Wherein in the step of providing the multi-coating layer, the multi-coating layer is mixed with a ferroelectric in the form of a powder or a liquid. 16. The method of claim 15,
Wherein a ferroelectric thin film layer is further provided on the multi-coating layer in the step of providing the multi-coating layer. 12. The method of claim 11,
Wherein a ferroelectric thin film layer is further provided on a touch surface formed on an upper surface of the cover layer after the step (b) of placing the fingerprint sensor on the bracket. 18. The method of claim 17,
Wherein the ferroelectric thin film layer is formed of one ferroelectric thin film or comprises a plurality of ferroelectric thin films and a spacer provided between the plurality of ferroelectric thin films in the step of preparing the ferroelectric thin film layer Gt; 12. The method of claim 11,
Wherein the step of mounting the fingerprint sensor on the bracket (step b) is followed by the step of fixing the fingerprint sensor by filling the molding material into the bracket or by inserting an additional bracket.

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