WO2019084835A1

WO2019084835A1 - Biometric recognition device and terminal apparatus

Info

Publication number: WO2019084835A1
Application number: PCT/CN2017/108898
Authority: WO
Inventors: 李绍佳; 郭益平
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2017-11-01
Filing date: 2017-11-01
Publication date: 2019-05-09

Abstract

A biometric recognition device and a terminal apparatus relate to the technical field of sensors. The biometric recognition device comprises: a substrate (20); a packaged portion comprising a biometric recognition sensor (21) and a light source (22) which are provided at the substrate (20); and a cover plate (23) having an optically transmissive region (24), wherein the packaged portion is positioned between the cover plate (23) and the substrate (20). The biometric recognition device is integrated with the light source (22), and thus can be used more conveniently and has a high applicability.

Description

Biometric device and terminal device

Technical field

The embodiments of the present invention relate to the field of sensor technologies, and in particular, to a biometric identification device and a terminal device.

Background technique

With the development of biometric sensors, especially the rapid development of fingerprint recognition sensors, the user's demand for biometric sensors is not only limited to functional convenience, but also increasingly pursues the appearance of differentiation, personalization and use. Facilitation.

The existing biometric module has no visible guiding function in a single and dark environment, which causes inconvenient use and poor adaptability, and it is difficult to meet the user's demand for differentiation and personalization.

Summary of the invention

In view of this, one of the technical problems to be solved by the embodiments of the present application is to provide a biometric identification device and a terminal device, which are used to overcome the defects of poor applicability of the biometric sensor in the prior art, so as to meet the user's differentiated requirements. Effect.

An embodiment of the present application provides a biometric identification device including: a substrate; an encapsulation portion on the substrate, the encapsulation portion includes a biometric sensor and a light source, and the biometric sensor and the light source are disposed on the substrate a cover plate, wherein the cover plate is provided with a light-transmitting region; wherein the package portion is located between the cover plate and the substrate.

Optionally, a light guiding layer is further disposed, the upper portion of the light guiding layer is bonded to the cover plate, and is located between the cover plate and the encapsulating portion, and the light guiding layer faces the light source A grating is provided on one side.

Optionally, the cover plate has a lower refractive index than the light guiding layer.

Optionally, the number of the light sources is one, and the density of the grating gradually increases in a direction in which the distance from the light source increases.

Optionally, the number of the light sources is two, and is disposed on two sides of the biometric sensor, and the grating near the midpoint of the connection of the two light sources is dense, away from the two light sources. The grating at the midpoint of the line is sparse.

Optionally, the grating is prismatic or curved.

Optionally, a first gap is formed between the light guiding layer and the package portion.

Optionally, the first gap is a filling layer or air, and the refractive index of the filling layer and the air is different from the refractive index of the light guiding layer.

Optionally, the encapsulating portion further includes a plastic sealing layer covering the biometric sensor and the light source, and the molding compound at the corresponding position of the light source is a light transmissive molding compound.

Optionally, a finger ring is further provided, the finger ring has a support platform, and a part of the cover plate is overlapped on the support platform of the finger ring.

Optionally, at least a portion of the cover plate is coated with a light-shielding coating on a portion of the finger ring.

According to another aspect of the present application, there is provided a terminal device comprising the above-described biometric device.

It can be seen from the above technical solution that the biometric identification device of the embodiment of the present application is used for biometric identification. The substrate is used to carry a structure such as a package portion and/or a cover plate. By providing a light source inside the package portion and providing a light-transmitting area on the cover plate, the biometric device can emit visible light to prompt the user to facilitate the user to use the light in a dark condition, thereby improving the indication of the biometric device. And ease of use, making biometric devices more adaptable. At the same time, the biometric identification device is differentiated and personalized in appearance, and can meet the needs of the user to beautify the appearance.

DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings to be used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present application, and other drawings can be obtained according to the drawings without any creative labor for those skilled in the art.

1 is a cross-sectional structural view showing a biometric device filled with a light permeable gas according to an embodiment of the present application;

2 is a cross-sectional structural view showing a biometric device filled with a filling layer according to an embodiment of the present application;

3 is a top plan view showing a cover of a biometric device according to an embodiment of the present application;

4 is a schematic perspective structural view of a first light guiding layer of a biometric device according to an embodiment of the present application;

FIG. 5 is a schematic perspective view showing a second light guiding layer of a biometric device according to an embodiment of the present application.

Description of the reference signs:

20, substrate; 21, biometric sensor; 22, light source; 23, cover plate; 24, light-transmissive region; 25, light guiding layer; 26, filling layer; 27, void; 28, plastic sealing layer; 30, finger ring; 31, light-shielding coating; 32, circuit board; 33, grating; 34, adhesive; 35, bonding line; 36, solid crystal glue.

Detailed ways

In order to make the object, the features and the advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. The described embodiments are only a part of the embodiments of the embodiments of the present application, and not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of protection of the embodiments of the present application.

The specific implementation of the embodiments of the present application is further described below with reference to the accompanying drawings.

As shown in FIGS. 1-5, according to an embodiment of the present application, the biometric device includes a substrate 20, a package portion, and a cover plate 23. The encapsulation portion includes a biometric sensor 21 and a light source 22, and the biometric sensor 21 and the light source 22 are disposed on the substrate 20. A light transmitting region 24 is provided on the cover plate 23. The package portion is located between the cover plate 23 and the substrate 20 . The biometric sensor 21 is configured to acquire biometric information of the user, for example, to acquire a fingerprint of the user. The substrate 20 is used to carry a structure such as a package portion and a cover plate 23.

By providing the light source 22 inside the package portion, the volume of the biometric device can be effectively reduced; by providing the light transmissive region 24 on the cover plate 23, the biometric device can emit visible light, which is convenient for the user to use in the case of dim light. . At the same time, the biometric device is differentiated and personalized by providing differently shaped light-transmissive areas on the cover.

Alternatively, in the present embodiment, the biometric sensor 21 is fixed to the substrate 20 by a bonding adhesive 36. However, it is not limited thereto, and other suitable means for fixing the biometric sensor 21 to the substrate 20 are also applicable.

The encapsulation portion also includes a plastic encapsulation layer 28 that covers the biometric sensor 21 and the light source 22 for encapsulating the biometric sensor 21 and the light source 22. The molding layer 28 includes an opaque portion and The light transmissive portion, wherein the molding compound covering the biometric sensor 21 is an opaque portion, and the molding material covering the light source 22 is a light transmitting portion 29, and the light emitted from the light source 22 is concentrated through the plastic sealing layer. . The opaque portion may be selected from black opaque aluminum oxide or epoxy molding compound. The light transmissive portion 29 may be an epoxy molding compound which is a translucent or fully transparent material. In one embodiment, the light source 22 and the biometric sensor 21 are also filled with an opaque molding compound.

Light source 22 can be an LED visible light source that is soldered to substrate 20 by solder paste. The light source 22 is small in size and can be packaged with the biometric sensor to enable the biometric device to emit visible light while meeting the demands of miniaturization and thinning. In addition, such a light source 22 has low energy consumption and contributes to energy saving. Of course, in other embodiments, the light source 22 can also be other devices capable of emitting visible light, such as a luminescent coating, a light bulb of sufficient volume, and the like. The number of light sources 22 and the location within the package can take a variety of approaches. In one embodiment, as shown in FIGS. 1 and 2, there may be two light sources 22 disposed on both sides of the biometric sensor 21. Of course, the light source 22 may also be one or two or more, and two or more light sources may be disposed around the biometric sensor 21 or may be linearly arranged.

The light source 22 and the biometric sensor 21 are disposed on the same substrate 20, and finally sealed by injecting an epoxy molding compound through a mold.

In the present embodiment, the biometric sensor 21 is connected to the substrate 20 through a bonding wire 35 to realize data and signal transmission. In other embodiments, the connection between the biometric sensor 21 and the substrate 20 can also be achieved through a through silicon via.

The cover plate 23 is located above the encapsulating portion and mainly serves as a protection and light guiding function. The thickness may be several tens of micrometers to several hundreds of micrometers. A material having a certain dielectric constant and a refractive index lower than the light guiding layer 25 may be selected, such as glass. , translucent zirconia ceramics, sapphire, optical resin film, etc., are not limited thereto.

The cover plate 23 has a light transmissive area, and different patterns can be formed on the biometric device by providing differently shaped light transmissive areas. The formation of the light-transmissive region can be achieved by adding a light-transmitting coating and a light-shielding coating on the cover plate 23, and the material of the coating can be selected from an ink or a non-conductive coating.

In one embodiment, the cover plate 23 may be a transparent material having a light-shielding coating 31 and a light-transmitting region 24 thereon. Both can be achieved by applying an ink layer on the cover plate 23, and by adjusting the composition of the carbon content in the ink layer, an opaque light-shielding coating 31, a semi-transmissive or fully transparent transparent region 24 can be formed. The ink can be attached to the transparent cover 23 by silk screen or the like. The thickness of the ink opaque coating and the light transmissive coating may range from a few microns to tens of microns.

As shown in FIG. 3, a light-shielding coating 31 and/or a light-transmissive coating may be applied over the cover sheet 23 to form a light-transmissive region 24 on which the desired pattern is formed. By adding a light-emitting and/or light-transmitting structure to the biometric device, product differentiation and personalization can be highlighted.

In one embodiment, the biometric device further includes a light guiding layer 25 between the cover plate 23 and the encapsulation portion and bonded to the cover plate 23 above. The light guiding layer is used to reflect and/or refract light emitted by the light source 22 to uniformly illuminate the light through the cover 23.

The light guiding layer 25 has a thickness of several tens of micrometers to several hundred micrometers, and may be a transparent optical material which is plastic and can be processed into an optical structure, and has a refractive index higher than that of the cover plate 23, and may be, for example, PET (Polyethylene terephthalate). , polyterephthalic plastics), PMMA (polymethyl methacrylate), PC (Polycarbonate, polycarbonate), TPU (thermoplastic polyurethanes), UV resin, etc. Limited to this.

In one embodiment, the side of the light directing layer 25 that faces the light source 22 is provided with a grating 33 (or dot), as shown in FIG. The grating 33 refracts, reflects, and the like the light emitted from the light source 22 to make the light intensity distribution on the light-transmitting region 24 of the cover 23 relatively uniform. Alternatively, the grating 33 comprises a prismatic grating (as shown in Figure 4) or an arcuate grating (as shown in Figure 5). Of course, the grating 33 can also be of other forms of grating, depending on the needs. The width of the grating and the spacing of adjacent gratings are from a few microns to a few hundred microns. According to the number of light sources and the setting method, the depth, size and density of the grating are adjusted accordingly to ensure that the light passing through the light guiding layer reaches the cover evenly.

For example, when the number of the light sources 22 is one, the density of the grating of the grating 33 gradually increases in the direction in which the distance from the light source 22 increases. That is, the distance between the adjacent two grating indentations at the position of the grating 33 near the light source 22 is large, and as it gradually moves away from the light source 22, the spacing between adjacent two grating indentations is gradually reduced. When two light sources 22 are disposed on both sides of the biometric sensor 21, as shown in Figs. 1 and 2, the grating at the midpoint of the line connecting the two light sources 22 is dense, and the grating away from the midpoint of the line connecting the two light sources is sparse. . Of course, in different situations, depending on the customization effect, the depth, size, and density of the grating can be further debugged and selected to achieve uniform illumination and reflection. When there are more than two light sources 22, depending on the position and number of the light sources 22 and the different customization effects, the settings of the gratings are adjusted accordingly, as long as the light is uniformly transmitted.

The grating 33 may be disposed on the light guiding layer 25 by an etching or transfer technique. When using the transfer technology, first make a micro-pattern effect in the mold, and then screen the UV-curable adhesive, and laminate with the light guide, the most After the completion of the UV curing, the mold is released, so that the microstructure pattern of the glue material can be transferred to the surface of the light guiding layer. When etching is used, it may be dry etching or wet etching. First, a size pattern of the microstructure is formed on the reticle, and after exposure and development with a photoresist, the surface material of the light guiding layer itself is etched to transfer the pattern onto the light guiding layer. Or it is etched by the screen printing method and then demolded. Different patterns of different depths can be obtained after etching.

In one embodiment, the light guiding layer and the encapsulating portion may further have a first gap, and the majority of the light emitted by the light source 22 is totally reflected upward by the difference in refractive index between the mediums, thereby improving the overall coupling efficiency of the light. Optionally, as shown in FIG. 2, a filling layer 26 may be included in the first gap, and the filling layer 26 may be transparent and have a refractive index different from that of the light guiding layer. The filling layer 26 may be an adhesive, so that the bonding of the light guiding layer 25 can be achieved, and the processing of the light can be realized by the difference in refractive index between the adhesive and the light guiding layer 25.

Further, as shown in FIG. 1, it is also possible to fill the first gap only with air, and it is also possible to make most of the light rays totally upward by utilizing the difference in refractive index between the air and the light guiding layer.

Also below the substrate 20 is a circuit board 32 that can have the transfer of data, signals, energy, etc., such as signals from the biometric sensor 21 to other controllers or processors, and the like.

In one embodiment, as shown in FIGS. 1 and 2, the biometric device further includes a finger ring 30 that is disposed around the cover, the encapsulation, and the substrate and that can be fixedly attached to the circuit board 32 by an adhesive 34. The finger ring 30 can be made of a material having a certain hardness such as plastic, stainless steel or aluminum alloy. The cross-sectional area of the cover plate 23 is larger than the cross-sectional area of the package portion, and the finger ring 30 has a support table for supporting the cover plate 23, and a part of the cover plate 23 is overlapped on the support table of the finger ring 30. The portion of the cover plate 23 that is overlapped on the support table is fixed to the support table by the adhesive 34. The binder 34 may be a glue or a film of an epoxy group, an acrylic system, a silica gel system or the like.

The finger ring 30 can make the biometric device waterproof and dustproof, effectively protect the internal components, and prevent the light emitted by the light source 22 from leaking from the side of the biometric device.

Optionally, at least a portion of the cover plate 23 that is overlapped over the finger ring 30 is coated with a light-shielding coating 31. Light leakage is further prevented by applying the light-shielding coating 31.

The biometric device of the present embodiment simplifies the illumination and/or light transmissive structure, integrating the illumination and/or light transmissive structure on a thinner, smaller biometric device, enhancing the personalization and differentiation of the device. In this embodiment, the biometric device is a fingerprint recognition device. Of course, in other embodiments, the biometric device may be another device capable of biometric recognition.

The biometric device can be applied to any device with a biometric sensor, including but not limited to a mobile communication handset (eg, a cell phone, pad, etc.), an electronic laptop, or other device.

According to another aspect of the present application, there is provided a terminal device including a biometric device, which is the above-described biometric device.

The biometric device can be a handheld device such as a cell phone, a pad, or the like.

The biometric device and the terminal device of the embodiment have the following beneficial effects:

The visible light biometric identification device adds a light-emitting or light-transmitting pattern to the appearance of the biometric sensor device to increase product differentiation and personalization. A light-emitting or light-transmissive structure is integrated on a thinner, smaller biometric sensor device. Simplify the independent optical lighting module by designing the optical structure together with the package structure. While effectively realizing the biometric function, light or light is transmitted on the appearance surface of the device.

It should be noted that the above embodiments are only used to explain the technical solutions of the embodiments of the present application, and are not limited thereto; although the embodiments of the present application are described in detail with reference to the foregoing embodiments, those skilled in the art should understand The technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present application. Spirit and scope.

Claims

A biometric device comprising:

Substrate

a package portion, located above the substrate, the package portion includes a biometric sensor and a light source, and the biometric sensor and the light source are disposed on the substrate;

a cover plate, wherein the cover plate is provided with a light transmitting area;

The package portion is located between the cover plate and the substrate.
The biometric device according to claim 1, further comprising a light guiding layer, wherein the light guiding layer is bonded to the cover plate and located between the cover plate and the package portion, A grating is disposed on a side of the light guiding layer facing the light source.
The biometric device according to claim 2, wherein the cover plate has a lower refractive index than the light guiding layer.
The biometric identification device according to claim 2 or 3, wherein the number of the light sources is one, and the density of the grating gradually increases in a direction in which the distance from the light source increases.
The biometric device according to claim 2 or 3, wherein the number of the light sources is two, and is disposed on both sides of the biometric sensor, near the midpoint of the line connecting the two light sources The grating is dense, and the grating at the midpoint of the line away from the two light sources is sparse.
A biometric device according to any one of claims 2 to 5, wherein the grating is prismatic or curved.
The biometric device according to any one of claims 2 to 6, wherein the light guiding layer and the encapsulating portion have a first gap.
The biometric device according to claim 7, wherein the first gap is filled with a layer or air, and the refractive index of the filling layer and air is different from the refractive index of the light guiding layer.
The biometric device according to any one of claims 1 to 8, wherein the encapsulation portion further comprises a plastic sealing layer covering the biometric sensor and the light source, and the corresponding position of the light source The molding compound is a light-transmissive molding compound.
The biometric device according to any one of claims 1 to 8, further comprising a finger ring, the finger ring having a support table, a portion of the cover plate being overlapped on a support table of the finger ring.
The biometric device of claim 10, wherein at least the overlap of the cover A portion of the finger ring is coated with a light-shielding coating.
A terminal device comprising the biometric device according to any one of claims 1-11.