TWI545483B - Touch panel with a function of fingerprint identification - Google Patents

Description

Touch panel with fingerprint recognition

The invention relates to a touch panel, in particular to a touch panel with a fingerprint recognition function.

With the development of technology, fingerprint recognition technology is widely used in various electronic devices by virtue of its security recognition function. In recent years, fingerprint recognition technology applied to smart phones has become a focus of public attention due to its excellent anti-theft function and privacy protection function of personal mobile phone content, and will become the development direction of similar electronic devices.

In the prior art, taking a smart phone as an example, the fingerprint recognizer is set corresponding to an activity button on the smart phone, for example, a home button. The activity button is generally disposed in the special through hole of the protection cover of the mobile phone, and there is a gap between the protection cover of the mobile phone, and the small dirt is easily attached to the periphery of the special through hole, thereby affecting the appearance of the mobile phone and reducing the user experience. Comfort. In addition, the special through hole is often formed by drilling a hole in the entire protective cover plate and grinding, which is difficult to process and affects the overall stress distribution of the protective cover plate, thereby causing damage to the strength of the protective cover plate. As a result, it affects both the yield of the process and the performance of the product.

In order to solve the above technical problem, the present invention provides a touch panel having a fingerprint recognition function, which includes a fingerprint recognition module disposed in a through hole of a first substrate, wherein the fingerprint recognition module and the first substrate and the first The two substrates are bonded together.

In one embodiment, a first adhesive layer is disposed between the first substrate and the second substrate to conform to the first substrate and the second substrate.

In one embodiment, a second adhesive layer is disposed between the fingerprint recognition module and the second substrate to fit the fingerprint recognition module and the second substrate.

In an embodiment, the fingerprint recognition module is fixed in the through hole of the first substrate by a glue.

In one embodiment, a touch sensing structure is further disposed on the surface of the first substrate away from the second substrate.

In an embodiment, a touch sensing structure is further disposed on the surface of the first substrate adjacent to the second substrate.

In one embodiment, a touch sensing structure is further disposed on the surface of the second substrate adjacent to the first substrate.

In an embodiment, the method further includes a shielding layer disposed on the surface of the second substrate and located between the first substrate and the second substrate, and the orthographic projection on the second substrate covers at least the fingerprint identification module The orthographic projection on the two substrates.

In an embodiment, the second substrate has a recessed portion, and the orthographic projection of the recessed portion and the fingerprint recognition module on the second substrate overlap each other.

In an embodiment, a shielding structure is further disposed between the first substrate and the second substrate and disposed around the fingerprint recognition module.

In an embodiment, a shielding structure is further disposed between the second substrate and the shielding layer and disposed around the fingerprint recognition module.

In an embodiment, the shielding layer is further disposed between the second substrate and the shielding structure, and the shielding structure is disposed around the fingerprint recognition module.

In an embodiment, the second substrate is formed of sapphire glass.

The invention provides a touch panel with a fingerprint recognition function by disposing the fingerprint recognition module in the through hole of the first substrate and then bonding with the second substrate, and the second substrate for protecting the product is not needed (ie, The protective cover of the product is perforated to ensure the integrity of the second substrate and maintain the strength of the second substrate, thereby ensuring product performance.

100, 101, 102‧‧‧ touch panels

11‧‧‧First substrate

110‧‧‧through hole

12‧‧‧Fingerprint Identification Module

13‧‧‧second substrate

130‧‧‧Depression

14‧‧‧First adhesive layer

15‧‧‧Second adhesive layer

16‧‧‧Touch sensing structure

161‧‧‧electrode layer

1611‧‧‧First axial electrode

1612‧‧‧second axial electrode

1613‧‧‧Insulation

162‧‧‧ wire layer

17‧‧‧Shielding layer

170‧‧‧ Graphic structure

18‧‧‧ colloid

19‧‧‧Shielding structure

20‧‧‧ Conductive material layer

D1‧‧‧ first direction

D2‧‧‧ second direction

V1‧‧ visible area

V2‧‧‧ non-visible area

V21‧‧‧ fingerprint identification area

1 is a front elevational view of a touch panel having a fingerprint recognition function according to the present invention.

Figure 2 is a cross-sectional view of Figure 1 taken along section line AA'.

FIG. 3A is a schematic structural diagram of a touch panel with a fingerprint recognition function according to an embodiment of the present invention.

FIG. 3B is a schematic diagram of a second substrate of a touch panel having a fingerprint recognition function according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a touch sensing structure of a touch panel with a fingerprint recognition function according to an embodiment of the present invention.

FIG. 5A is a schematic diagram of a mask structure of a touch panel with a fingerprint recognition function according to an embodiment of the present invention.

FIG. 5B is a schematic diagram of a mask structure of a touch panel with a fingerprint recognition function according to an embodiment of the present invention.

Figure 6 is a cross-sectional view of Figure 1 taken along section line AA'.

Figure 7 is a cross-sectional view of Figure 1 taken along line AA'.

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments. It is understood that the positional relationship of "upper" and "lower" mentioned below is based on the positional description of the illustration to facilitate a clear description of the technical content, and is not intended to limit the technical content of the present invention.

1 and FIG. 2, FIG. 1 is a front view of a touch panel having a fingerprint recognition function according to the present invention, and FIG. 2 is a cross-sectional view along line AA' of FIG. 1 showing a preferred embodiment of the present invention. Touch panel for fingerprint recognition. In this embodiment, the touch panel 100 having the fingerprint recognition function includes a first substrate 11 , the first substrate 11 is provided with a through hole 110 , and the second substrate 13 is located on the first substrate 11 and disposed opposite to the first substrate 11 . The fingerprint recognition module 12 is disposed in the through hole 110 of the first substrate 11. The first substrate 11 and the fingerprint recognition module 12 are bonded to the second substrate 13 through the first adhesive layer 14 and the second adhesive layer 15 respectively. The touch sensing structure 16 is disposed on the lower surface of the first substrate 11 .

The second substrate 13 is formed by a reinforced glass or a rigid plastic substrate, and can be used as a protective cover of the touch panel 100 having a fingerprint recognition function. The upper surface of the second substrate 13 can be directly touched by the user. Operation, preferably, the second substrate 13 can be made of sapphire glass The glass is formed to provide a better protection function for the touch panel 100 and further improve the quality of the touch panel 100 because of its high hardness and excellent scratch resistance. In order to ensure that the fingerprint recognition module 12 can perform fingerprint recognition more accurately, the thickness of the second substrate 13 is preferably less than or equal to 0.3 mm. The lower surface of the second substrate 13 is provided with a shielding layer 17 between the second substrate 13 and the first bonding layer 14. The orthographic projection of the masking layer 17 on the second substrate 13 covers the orthographic projection of the fingerprint recognition module 12 on the second substrate 13. The shielding layer 17 is formed of an opaque ink or a photoresist material for shielding some opaque components under the second substrate 13, such as a fingerprint recognition module. The shielding layer 17 may be a single layer structure or a multilayer structure formed by stacking a plurality of layers of materials, which is not limited in the present invention. In the touch panel 100 with the fingerprint recognition function, the area where the shielding layer 17 is located is defined as the non-visible area V2, and the area other than the non-visible area V2 is the visible area V1. The non-visible area V2 includes a fingerprint identification area V21, and the fingerprint recognition module 12 is disposed in the non-visible area V2, and the area where it is located is defined as the fingerprint identification area V21.

Please refer to FIG. 3A. FIG. 3A is a schematic structural diagram of a touch panel with a fingerprint recognition function according to an embodiment of the present invention. In order to distinguish the fingerprint identification area V21 from the other parts of the non-visible area V2 (as shown in FIG. 2), the user can operate on the fingerprint identification area V21 accurately and conveniently, and the embodiment of the present invention uses the shielding layer. 17 is hollowed out and filled with a light-shielding material different in color from the shielding layer 17 to form a graphic structure 170 for indicating the fingerprint identification area V21. In the embodiment shown in FIG. 3A, the illustrated structure 170 is surrounded by non-visual The region V21 is disposed. In other embodiments of the present invention, the illustrated structure 170 may also be other pattern shapes. The present invention does not limit the manner in which the structure 170 is illustrated.

Referring to FIG. 3B, FIG. 3B is a schematic diagram of a second substrate of a touch panel having a fingerprint recognition function according to an embodiment of the present invention, and illustrates another embodiment of the fingerprint identification area V21 in the present invention. The second substrate 13 is recessed in the direction of the lower surface (the surface opposite to the upper surface) from the upper surface (the surface for the user to perform the touch operation) in the fingerprint recognition area V21 to form the recess 130, and the recess 130 is on the second substrate 13 The orthographic projection of the upper and the orthographic projections of the fingerprint recognition module 12 on the second substrate 13 overlap each other, and the user performs a pressing operation on the depressed portion 130 to perform fingerprint signal input.

Referring to FIG. 2 again, the first substrate 11 is formed of a transparent glass or plastic substrate, and a through hole 110 is disposed thereon for receiving the fingerprint recognition module 12. The first substrate 11 is first The bonding layer 14 is bonded to the lower surface of the second substrate 13. In this embodiment, the first substrate 11 and the second substrate 13 are bonded to each other in a fully bonded manner. Specifically, the first bonding layer 14 is disposed. Between the first substrate 11 and the second substrate 13, and completely filled between the two. In other embodiments of the present invention, the first substrate 11 and the second substrate 13 may be attached to each other. Specifically, the first bonding layer 14 is disposed on the first substrate 11 and the second substrate 13 . There is only a peripheral position of the area where the first substrate 11 and the second substrate 13 are in contact with each other.

The fingerprint recognition module 12 is disposed in the through hole 110 of the first substrate 11 and is adhered to the lower surface of the second substrate 13 by the second adhesive layer 15. The second adhesive layer 15 is disposed on the fingerprint recognition module 12 and Between the second substrates 13. It should be noted that, in the embodiment of the present invention, the fingerprint recognition module 12 is fixed in the through hole 110 of the first substrate 11 and then bonded to the second substrate 13 in this embodiment. The inner side wall of the through hole 110 of the first substrate 11 and the fingerprint recognition module 12 are filled with the colloid 18, so that the fingerprint recognition module 12 is fixed in the first substrate 11. It can be understood that the fingerprint identification module 12 is fixed to the first The manner of the substrate 11 may be other methods, such as fixing by providing an auxiliary element, or fixing by mutual engagement by controlling the size or shape of the through hole 110. Since the detailed structure of the fingerprint recognition module 12 is well known to those skilled in the art, it will not be described again.

Please refer to FIG. 4. FIG. 4 is a schematic diagram of a touch sensing structure of a touch panel with a fingerprint recognition function according to an embodiment of the present invention. The touch sensing structure 16 ( FIG. 2 ) is disposed on the lower surface of the first substrate 11 , that is, the surface of the first substrate 11 away from the second substrate 13 . The touch sensing structure 16 includes an electrode layer 161 located in the visible region V1 and a wire layer 162 located in the non-visible region V2. The electrode layer 161 and the wire layer 162 are electrically connected to each other. The electrode layer 161 includes a plurality of first axial electrodes 1611, a plurality of second axial electrodes 1612, and an insulating layer 1613. The plurality of first axial electrodes 1611 extend in the first direction D1 and are spaced apart in the second direction D2, and the second axial electrodes 1612 extend in the second direction D2 and are spaced apart in the first direction D1. The insulating layer 1613 is composed of a plurality of insulating blocks formed at the intersection of the first axial electrode 1611 and the second axial electrode 1612 to electrically isolate the first axial electrode 1611 from the second axial electrode 1612. The first axial electrode 1611 and the second axial electrode 1612 are electrically connected to the wire layer 162, respectively. The first axial electrode 1611 and the second axial electrode 1612 are transparent conductive structures, and the material thereof may be one or more of conductive materials such as indium tin oxide, nano silver, graphene, carbon nanotubes, and metal mesh. . The insulating layer 1613 is transparent The insulating structure may be made of cerium oxide, transparent photoresist or the like. The wire layer 162 is formed of a metal material, located in the non-visible area V2, disposed under the shielding layer 17 (as shown in FIG. 2), and the wire layer 162 is covered by the shielding layer 17 without being visible to the user. In this embodiment, the touch sensing structure 16 is a sensing structure of a single layer of conductive material. In other embodiments of the present invention, the sensing structure may be an inductive structure formed by stacking two or more layers of conductive materials. This is limited to this.

Referring to FIG. 2 again, the touch panel 100 with the fingerprint recognition function of the present invention may further include a shielding structure 19 disposed between the first substrate 11 and the second substrate 13 and disposed around the fingerprint recognition module 12 . The shielding structure 19 is used for providing the fingerprint recognition module 12 with a function of shielding electromagnetic noise. In the embodiment, the shielding structure 19 is a ring-shaped metal structure disposed on the surface of the first substrate 11 and located on the first substrate 11 Between the first adhesive layer 14 and the first adhesive layer 14, it is noted that in other embodiments of the present invention, please refer to FIG. 5A and FIG. 5B respectively, and the shielding structure 19 may be disposed on the second substrate 13 and the first adhesive layer 14 ( Between Figure 2).

Please refer to FIG. 5A. FIG. 5A is a schematic structural diagram of a touch panel with a fingerprint recognition function according to an embodiment of the present invention. The shielding structure 19 is disposed on the lower surface of the second substrate 13 and located between the second substrate 13 and the shielding layer 17. Since the shielding structure 19 is formed of a metal material, the color thereof can be distinguished from the shielding layer 17, and the second layer 13 is disposed on the second layer. Between the substrate 13 and the shielding layer 17, the user can see the shielding structure 19 from the touch operation surface, so when it is disposed around the fingerprint recognition area V21, it can be used to indicate the fingerprint identification area V21, so that other indication structures can be omitted.

Please refer to FIG. 5B. FIG. 5B is a schematic structural diagram of a touch panel with a fingerprint recognition function according to an embodiment of the present invention. The shielding structure 19 is disposed between the shielding layer 17 and the first bonding layer 14, corresponding to the hollow portion of the shielding layer 17 in the embodiment shown in FIG. 3A, and the color difference between the shielding layer 17 and the shielding layer 17 can be used by the user. The shield structure 19 can be seen from the hollow of the masking layer 17 to simultaneously implement the function of indicating the fingerprint recognition area V21, and the step of filling other masking materials in Fig. 3A is omitted. It should be noted that, in the embodiment, the shielding structure 19 is an independently formed metal component, which is disposed directly under the hollow portion of the shielding layer 17, and the user can see the shielding structure 19 through the hollow portion of the shielding layer 17, in other words, The hollow portion of the shielding layer 17 is in a vacant state. In other embodiments of the present invention, the shielding structure 19 may be formed on the surface of the shielding layer 17 by sputtering or printing, so that the hollow portion of the shielding layer 17 may be filled. The material of the shielding structure 19 is partially or completely embedded in the shielding layer 17 from the final structural point of view.

Referring again to FIG. 2, the first adhesive layer 14, the second adhesive layer 15, and the colloid 18 have respective material properties. The first adhesive layer 14 is formed of a transparent optical adhesive, which may be a solid film or a liquid glue. The second adhesive layer 15 is formed by an explosion-proof optical adhesive. Compared with the general optical adhesive, the masking effect on the electrical signal is weak, and is disposed between the second substrate 13 and the fingerprint recognition module 12, which can be reduced. The attenuation of the electrical signal transmitted from the upper surface of the second substrate 13 to the fingerprint recognition module 12 has little effect on the sensitivity of the fingerprint recognition module 12. The colloid 18 is a liquid fluid adhesive that can be flexibly filled between the sidewall of the through hole 110 of the first substrate 11 and the fingerprint recognition module 12 .

In the present invention, the fingerprint recognition module 12 is embedded in the first substrate 11 and adhered to the complete second substrate 13 to form the touch panel 100 having the fingerprint recognition function, so that the second substrate 13 does not need to be perforated. The strength of the second substrate 13 itself is not affected, and the performance of the product is ensured. In addition, the setting of the fingerprint recognition module 12 is not limited by the active button, and the complicated packaging structure of the movable button is omitted, and the setting is flexibly In the touch panel, the structure of the product is simplified and the flexibility of product design is improved under the premise of ensuring the same fingerprint recognition function.

In the above embodiment, the touch sensing structure 16 is disposed on the lower surface of the first substrate 11. In other embodiments of the present invention, the touch sensing structure 16 may be disposed at other positions. 6 and FIG. 6 are cross-sectional views along line AA' of FIG. 1 showing a touch panel having a fingerprint recognition function according to another preferred embodiment of the present invention.

The difference between the present embodiment and the previous embodiment is that the touch sensing structure 16 is disposed on the upper surface of the first substrate 11, that is, the surface of the first substrate 11 adjacent to the second substrate 13 is disposed on the first substrate 11 and Between the first adhesive layers 14. In addition, the touch panel 101 having the fingerprint recognition function in the embodiment further includes a conductive material layer 20 disposed on the lower surface of the first substrate 11 for providing the touch sensing structure 16 with a function of shielding electromagnetic noise. The conductive material layer 20 is formed of a transparent conductive material, may be a full-surface structure, or may be disposed only on the periphery of the lower surface of the first substrate 11 to form a ring structure, which is not limited by the present invention. Other components in the touch panel 101 having the fingerprint recognition function in the present embodiment and the connection relationship between them are substantially the same as those in the previous embodiment, and details are not described herein.

Please refer to FIG. 1 and FIG. 7 simultaneously. FIG. 7 is a cross-sectional view of FIG. 1 along a section line AA'. A touch panel with a fingerprint recognition function according to still another preferred embodiment of the present invention is shown. The difference between the embodiment and the previous embodiment is that the touch sensing structure 16 is disposed on the lower surface of the second substrate 13, that is, the surface of the second substrate 13 adjacent to the first substrate 11, and the shielding layer 17 is located on the second substrate. 13 is between the touch sensing structure 16. In the touch panel 102 with the fingerprint recognition function of the embodiment, the touch sensing structure 16 is directly disposed on the surface of the second substrate 13. The fingerprint recognition module 12 is disposed in the through hole 110 of the first substrate 11, and then two The bonding on the first substrate 11 avoids the interaction between the plurality of processes in which the touch sensing structure 16 is formed on the first substrate 11 and is fixed to the fingerprint recognition module 12, and the first substrate 11 is reduced. The related process difficulty can improve the process yield to a certain extent, and the touch sensing structure 16 is disposed on the lower surface of the second substrate 13, so that the touch sensing structure 16 is closer to the user operation surface, so that the user touches The signal is more intense, which in turn increases the sensitivity of the touch sensing structure 16. Other components in the touch panel 102 having the fingerprint recognition function in this embodiment and the connection relationship between them are substantially the same as those in the previous embodiment, and details are not described herein.

It should be noted that, in the above embodiment, the touch sensing structure 16 is directly formed on the surface of the first substrate 11 or the second substrate 13. In other embodiments of the present invention, the touch sensing structure 16 may also be formed in advance. The film is attached to the surface of the first substrate 11 or the second substrate 13 on a film, which is not limited by the present invention.

In summary, the present invention provides a touch panel having a fingerprint recognition function by disposing a fingerprint recognition module in a through hole of a first substrate and then bonding with the second substrate, and does not need to be used for protecting the product. The second substrate (ie, the protective cover of the product) is perforated to ensure the integrity of the second substrate and maintain the strength of the second substrate, thereby ensuring product performance.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

100‧‧‧ touch panel

11‧‧‧First substrate

110‧‧‧through hole

12‧‧‧Fingerprint Identification Module

13‧‧‧second substrate

14‧‧‧First adhesive layer

15‧‧‧Second adhesive layer

16‧‧‧Touch sensing structure

161‧‧‧electrode layer

162‧‧‧ wire layer

17‧‧‧Shielding layer

18‧‧‧ colloid

19‧‧‧Shielding structure

V1‧‧ visible area

V2‧‧‧ non-visible area

V21‧‧‧ fingerprint identification area

Claims (13)

A touch panel with a fingerprint recognition function includes: a fingerprint recognition module disposed in a through hole of a first substrate, wherein the fingerprint identification module and the first substrate are attached to a second substrate. The touch panel with the fingerprint recognition function of claim 1, further comprising: a first adhesive layer disposed between the first substrate and the second substrate to fit the first substrate and The second substrate. The touch panel with the fingerprint recognition function of claim 2, further comprising: a second adhesive layer disposed between the fingerprint recognition module and the second substrate to fit the fingerprint recognition mode The group is associated with the second substrate. The touch panel with the fingerprint recognition function of claim 1, wherein the fingerprint recognition module is fixed in the through hole of the first substrate by a glue. The touch panel with the fingerprint recognition function of claim 1, further comprising: a touch sensing structure disposed on the surface of the first substrate away from the second substrate. The touch panel with the fingerprint recognition function of claim 1, further comprising: a touch sensing structure disposed on a surface of the first substrate adjacent to the second substrate. The touch panel with the fingerprint recognition function of claim 1, further comprising: a touch sensing structure disposed on the surface of the second substrate adjacent to the first substrate. The touch panel with the fingerprint recognition function of claim 1, further comprising: a shielding layer disposed on the surface of the second substrate and located between the first substrate and the second substrate, and The orthographic projection on the second substrate covers at least the orthographic projection of the fingerprint recognition module on the second substrate. The touch panel with the fingerprint recognition function of claim 1, wherein the second substrate has a recessed portion, and the recessed portion and the orthographic projection of the fingerprint recognition module on the second substrate overlap each other. The touch panel with the fingerprint recognition function of claim 1, further comprising: a shielding structure disposed between the first substrate and the second substrate and disposed around the fingerprint recognition module. The touch panel with fingerprint recognition function as described in claim 8 of the patent application further includes: A shielding structure is disposed between the second substrate and the shielding layer and disposed around the fingerprint recognition module. The touch panel with the fingerprint recognition function of claim 8 further includes: a shielding structure, the shielding layer is located between the second substrate and the shielding structure, and the shielding structure surrounds the fingerprint recognition mode Group settings. The touch panel with fingerprint recognition function according to claim 1, wherein the second substrate is formed of sapphire glass.