WO2018149058A1

WO2018149058A1 - Fingerprint device, and terminal apparatus

Info

Publication number: WO2018149058A1
Application number: PCT/CN2017/087590
Authority: WO
Inventors: 王磊; 毛维华; 吕仁; 尤佳庆
Original assignee: 华为技术有限公司
Priority date: 2017-02-16
Filing date: 2017-06-08
Publication date: 2018-08-23

Abstract

The present invention relates to the technical field of electronics, and relates to a fingerprint device and terminal apparatus enabling a fingerprint device to also serve as an antenna radiator, thus improving device integration, and accordingly reducing space occupation within a terminal apparatus. The fingerprint device (10) comprises: a fingerprint sensor portion (11) and a flexible circuit board portion (12), wherein the fingerprint sensor portion (11) is connected to a main board of a terminal via the flexible circuit board portion (12). The fingerprint sensor portion (11) and the flexible circuit board portion (12) are covered with a low-loss metal conductor (13) to form an antenna radiator. The fingerprint sensor portion (11) comprises a touch circuit (111), and the antenna radiator has an opening at a location corresponding to a touch surface of the touch circuit (111). A conductive strengthening board (121) is provided on the flexible circuit board portion (12), and electrically connected to the antenna radiator. The conductive strengthening board (121) is used as a power feed portion (14) of the antenna radiator.

Description

Fingerprint device and terminal device

Technical field

The present application relates to the field of electronic technologies, and in particular, to a fingerprint device and a terminal device.

Background technique

In the mobile terminal device, a fingerprint recognition function is generally provided. Currently, the fingerprint device that implements the fingerprint recognition function is disposed at the start home key position or below the back camera. These positions usually coincide with the antenna radiator position of the antenna. For example, the home key position usually coincides with the position of the far-field antenna of the terminal device, and the position below the back camera is usually the NFC (Near Field Communication) antenna. The position coincides. In the prior art, the antenna radiators of the fingerprint device and the antenna are usually separately disposed, occupying a large thickness in the overlapping positions of the two, and the installation of the two separately is not conducive to improving the integration degree of the device, and is internal to the terminal device. The space is occupied more.

Summary of the invention

The embodiment of the present application provides a fingerprint device and a terminal device, which can multiplex the fingerprint device with the antenna radiator of the antenna to improve the integration degree of the device, thereby reducing the occupation of the internal space of the terminal device, and facilitating the small terminal device. Chemical, thin and light.

To achieve the above objective, the embodiment of the present application adopts the following technical solutions:

In a first aspect, a fingerprint device is provided, comprising: a fingerprint sensor portion and a flexible circuit board portion, wherein the fingerprint sensor portion is connected to the main board of the terminal through the flexible circuit board portion; the fingerprint sensor portion and the flexible circuit board portion are covered with low loss of communication The metal conductor forms an antenna radiator; the fingerprint sensor portion includes a touch circuit, and the antenna radiator corresponds to the touch surface of the touch circuit; the flexible circuit board portion is provided with a conductive reinforcing plate, and the conductive reinforcing plate is electrically connected to the antenna radiator, and is electrically conductive. The stiffener is used as the feed portion of the antenna radiator. Compared with the prior art, the solution provided by the present application forms an antenna radiator by covering a low loss metal conductor connected in a portion of the fingerprint sensor portion and the flexible circuit board portion, and a conductive reinforcing plate is disposed on the flexible circuit board portion as an antenna radiator. The feeding portion, and the antenna radiator is hollowed out at the touch surface of the touch circuit corresponding to the fingerprint sensor portion, thereby not affecting the touch function of the fingerprint device, thereby realizing effective multiplexing of the fingerprint device and the antenna radiator of the antenna, The space occupied by the fingerprint device is effectively utilized, the integration degree of the device is improved, and the occupation of the internal space of the terminal device is reduced, which is advantageous for miniaturization, thinning and thinning of the terminal device.

In conjunction with the first aspect, in a first possible implementation, the fingerprint sensor portion includes a touch circuit and a support plate located below the touch circuit, wherein the antenna radiator serves as a support plate for the touch circuit. In the solution, the support plate under the touch circuit is multiplexed into an antenna radiator, so that the antenna radiator and the touch circuit share the support plate, which can effectively reduce the thickness of the fingerprint device and the antenna radiation combined portion.

In conjunction with the first aspect, in a second possible implementation, the flexible circuit board portion is plated with a low loss metal conductor.

In conjunction with the first aspect, in a third possible implementation, the feed portion includes a feed point and/or a location. For example, a PIFA (Planar Inverted F Antenna) antenna has a feed point and a location, a monopole antenna has only one feed point, and a PIFA antenna plus a parasitic antenna has two feed points and one location.

In conjunction with the first aspect, in a fourth possible implementation, the fingerprint device further includes a fingerprint chip attached to the flexible circuit board portion. A shielding cover is disposed outside the fingerprint chip, and the shielding cover is grounded, wherein the shielding cover is electrically connected to the ground through the conductive cloth. Here, the fingerprint chip mainly processes the touch signal generated by the fingerprint sensor part in a manner of detection, conversion, etc., and shielding the fingerprint chip through the shield cover to avoid interference of the external signal on the fingerprint chip.

In a second aspect, a terminal device is provided, including any of the above fingerprint devices.

In conjunction with the second aspect, in a first possible implementation, the fingerprint device is disposed in a non-display area of the display panel of the terminal device.

With reference to the second aspect, in a second possible implementation manner, the main board of the terminal device is provided with a spring foot, and the conductive reinforcing plate is electrically connected with the elastic foot; the elastic foot is used for grounding, or the elastic foot is connected to the main board The RF circuit on it. In combination with the first aspect, the foot is specifically configured to be coupled to a feed point or location. Exemplarily, for the PIFA antenna, two bullets are required, one for connecting the feed point and the other for connecting the foot. For the monopole antenna, only one foot is needed to connect the feed point; for the PIFA antenna Parasitic antennas require three footers to connect two feed points and one location.

In combination with the second aspect, in a third possible implementation manner, the main board of the terminal device is provided with a positioning bracket, and the conductive reinforcing plate is fixed on the positioning bracket.

In conjunction with the second aspect, in a fourth possible implementation, the fingerprint sensor portion is fixed to the main board of the terminal device by bonding or by a support frame.

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.

1 is a schematic structural diagram of a fingerprint device provided by the present application;

2 is a schematic structural view of a cross section of AA' of a fingerprint device provided in FIG. 1 of the present application;

3 is a schematic structural view of a BB' cross section of a fingerprint device provided in FIG. 1 of the present application;

4 is a schematic structural view of a BB' cross section of the fingerprint device shown in FIG. 1 according to another embodiment of the present application;

FIG. 5 is a schematic structural diagram of a terminal device according to the present application;

6 is a schematic diagram of simulation of return loss of an antenna radiator of a fingerprint device provided by the present application;

FIG. 7 is a schematic diagram of simulation of antenna efficiency of an antenna radiator of a fingerprint device provided by the present application.

detailed description

Embodiments of the present application will be described below with reference to the accompanying drawings.

The terms used in the embodiments of the present application are for the purpose of describing particular embodiments only, and are not intended to limit the invention. The singular forms "a", "the" and "the" It should also be understood that the term "and/or" as used herein refers to and includes one or more. Associated with any or all possible combinations of listed items. The character "/" in this article generally indicates that the contextual object is an "or" relationship.

The antenna radiator provided by the embodiment of the present application may be an antenna radiator of a far-field antenna or a near-field antenna of the terminal device, and the far-field antenna may be a single input single output (SISO) antenna, multiple input multiple output. (Multiple-Input Multiple-Output, MIMO) antenna, Planar Invert F Antenna (PIFA) antenna, near-field antenna may be an NFC antenna, etc., and the solution provided by the embodiments of the present application is not limited to the above antenna. It can be understood that any antenna structure including an antenna radiator should be applicable. The terminal device provided by the embodiment of the present application may be a mobile device with a fingerprint detection function, such as a mobile phone or a tablet computer.

An embodiment of the present application provides a fingerprint device 10, as shown in FIGS. 1, 2, and 3, comprising: a fingerprint sensor portion 11 and a flexible circuit board portion 12, wherein the fingerprint sensor portion 11 is connected to the terminal through the flexible circuit board portion 12. The main board; the fingerprint sensor portion 11 and the flexible circuit board portion 12 are covered with the connected low-loss metal conductor 13 to form an antenna radiator; the fingerprint sensor portion 11 includes a touch circuit 111, and the antenna radiator corresponds to the hollow surface of the touch surface of the touch circuit 111; The circuit board portion 12 is provided with a conductive reinforcing plate 121 electrically connected to the antenna radiator, and the conductive reinforcing plate 121 serves as a feeding portion 14 of the antenna radiator.

The fingerprint sensor portion 11 can be implemented in the following two manners: Method 1: Referring to FIG. 3, the fingerprint sensor portion 11 includes a touch circuit 111. The touch circuit 111 is wrapped with a low-loss metal conductor 13 except for the touch surface. The antenna radiator corresponds to the hollow at the touch surface of the touch circuit 111. In this scheme, the touch surface of the touch circuit 111 is used to detect a touch operation, and thus needs to be exposed. Or, the second method: as shown in FIG. 4, the fingerprint sensor portion 11 includes a touch circuit 111 and a support plate 112 under the touch circuit, wherein the antenna radiator is used as a support plate of the touch circuit 111, so that the support plate 112 adopts low loss. A metal conductor is formed. In the solution, the support plate under the touch circuit is multiplexed into an antenna radiator, so that the antenna radiator and the touch circuit share the support plate, which can effectively reduce the thickness of the fingerprint device and the antenna radiation combined portion.

To provide an example, a low loss metal conductor may be formed on the outside of the flexible circuit board portion 12 by electroplating. As shown in FIG. 2, the outer side of the flexible circuit board portion 12 is plated with a low loss metal conductor 13.

Compared with the prior art, the solution provided by the present application forms an antenna radiator by covering a low loss metal conductor connected in a portion of the fingerprint sensor portion and the flexible circuit board portion, and a conductive reinforcing plate is disposed on the flexible circuit board portion as an antenna radiator. The feeding portion, and the antenna radiator is hollowed out at the touch surface of the touch circuit corresponding to the fingerprint sensor portion, thereby not affecting the touch function of the fingerprint device, thereby realizing effective multiplexing of the fingerprint device and the antenna radiator of the antenna, The space occupied by the fingerprint device is effectively utilized, the integration degree of the device is improved, and the occupation of the internal space of the terminal device is reduced, which is advantageous for miniaturization, thinning and thinning of the terminal device.

In addition, the feed portion 14 includes feed points and/or locations. For example, a PIFA (Planar Inverted F Antenna) antenna has a feed point and a location, a monopole antenna has only one feed point, and a PIFA antenna plus a parasitic antenna has two feed points and one location.

Referring to FIG. 1, the fingerprint device further includes a fingerprint chip attached to the flexible circuit board portion 12. 15. A shield cover 16 is disposed outside the fingerprint chip, and the shield cover 16 is grounded, wherein the shield cover is electrically connected to the ground through the conductive cloth. Here, the fingerprint chip mainly processes the touch signal generated by the fingerprint sensor part in a manner of detection, conversion, etc., and shielding the fingerprint chip through the shield cover to avoid interference of the external signal on the fingerprint chip.

An embodiment of the present application further provides a terminal device, including any of the above fingerprint devices. As shown in FIG. 5, the fingerprint device 10 is disposed in the non-display area 20 of the display panel of the terminal device. An example is where the fingerprint device 10 is placed at the starting home key location of the non-display area.

The main board of the terminal device is provided with a spring foot, and the conductive reinforcing plate is electrically connected with the elastic foot, the elastic foot is used for grounding, or the elastic foot is connected to the radio frequency circuit on the main board. In combination with the first aspect, the foot is specifically configured to be coupled to a feed point or location. Exemplarily, for the PIFA antenna, two bullets are required, one for connecting the feed point and the other for connecting the foot. For the monopole antenna, only one foot is needed to connect the feed point; for the PIFA antenna Parasitic antennas require three footers to connect two feed points and one location.

A positioning bracket is disposed on the main board of the terminal device, and the conductive reinforcing plate is fixed on the positioning bracket. The positioning of the bracket is not limited. For example, the positioning bracket may be a plurality of positioning posts, which are fixed by being matched with the through holes of the conductive reinforcing plate, or the positioning bracket is a card slot that is shaped to match the outer edge of the conductive reinforcing plate. In addition, the fingerprint sensor portion is fixed to the main board of the terminal device by bonding or by a support frame.

The performance of the antenna radiator included in the fingerprint device of the above structure is tested under the 5G (5th-generation, fifth generation mobile communication technology) wireless communication condition, and the test results are shown in FIGS. 6 and 7, wherein

Figure 6 shows the return loss of the antenna at different frequencies, where the vertical axis is: return loss (in dB), the horizontal axis is: frequency (in GHz); Figure 7 shows the antenna of the antenna at different frequencies Efficiency, where the vertical axis is: antenna efficiency (in dB), and the horizontal axis is: frequency (in GHz); where, in the 5G free band 5.150GHz-5.825GHz, the return loss is less than -2.25dB, which corresponds to The antenna efficiency is greater than -5dB, and the antenna efficiency of this structural design meets the requirements.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It is within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A fingerprint device, comprising: a fingerprint sensor portion and a flexible circuit board portion, wherein the fingerprint sensor portion is connected to a main board of the terminal through the flexible circuit board portion;

The fingerprint sensor portion and the flexible circuit board portion are covered with a low loss metal conductor to form an antenna radiator, and the fingerprint sensor portion includes a touch circuit, and the antenna radiator is hollowed out corresponding to the touch surface of the touch circuit;

The flexible circuit board portion is provided with a conductive reinforcing plate electrically connected to the antenna radiator, and the conductive reinforcing plate is used as a feeding portion of the antenna radiator.
The fingerprint device according to claim 1, wherein the fingerprint sensor portion includes a touch circuit and a support plate located under the touch circuit, wherein the antenna radiator serves as a support plate of the touch circuit.
The fingerprint device of claim 1 wherein the flexible circuit board portion is plated with a low loss metal conductor.
The fingerprint device of claim 1 wherein the feed portion comprises a feed point and/or a location.
The fingerprint device of claim 1 wherein said fingerprint device further comprises a fingerprint chip attached to said flexible circuit board portion.
The fingerprint device according to claim 5, wherein a shield cover is disposed outside the fingerprint chip, and the shield is grounded.
A terminal device, comprising the fingerprint device according to any one of claims 1-6.
The terminal device according to claim 7, wherein the fingerprint device is disposed in a non-display area of a display panel of the terminal device.
The terminal device according to claim 7, wherein a mechanical foot is disposed on a main board of the terminal device, and the conductive reinforcing plate is electrically connected to the elastic foot;

The foot is used for grounding, or the foot is connected to a radio frequency circuit on the main board.
The terminal device according to claim 7, wherein a positioning bracket is disposed on the main board of the terminal device, and the conductive reinforcing plate is fixed on the positioning bracket.
The terminal device according to claim 7, wherein the fingerprint sensor portion is fixed to the main board of the terminal device by bonding or by a support frame.