Fingerprint recognition module and terminal equipment

Abstract

The present invention discloses a fingerprint recognition module and a terminal device, wherein the fingerprint recognition module comprises: a fingerprint recognition chip, the fingerprint recognition chip comprises a sensing area composed of a sensing unit array, when a user's finger touches the sensing unit, an oscillation excitation signal is applied to the fingerprint recognition chip, and a first coupling capacitor is formed between the user's finger and the sensing unit; an edge conductor, the edge conductor is arranged at the edge of the fingerprint recognition chip; a synchronization ring, the synchronization ring is located between the fingerprint chip and the edge conductor, and is arranged around the sensing area to absorb the electric field generated at the edge of the sensing area. The fingerprint recognition module of the embodiment of the present invention can improve the consistency of the collected fingerprint data, improve the fingerprint recognition rate, and enhance the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of fingerprint recognition, and in particular to a fingerprint recognition module and a terminal device. Background Art

[0002] At present, the principle of capacitive fingerprint recognition is to detect the coupling capacitance between the finger and the sensing area of ​​the fingerprint recognition chip. There are generally two types of excitation methods: one is external excitation that requires a metal ring, and the other is self-oscillation excitation of the sensing area without a metal ring. The external excitation that requires a metal ring is to apply the oscillation excitation signal to the finger through the metal ring, and then the sensing area detects the size of the coupling capacitor's charge and discharge to obtain the size of the coupling capacitor. Fingerprint recognition without a metal ring assumes that the finger end is grounded by default, and the coupling capacitor is excited by the induction area's own oscillation, and then the size of the charge and discharge released during the excitation is detected to obtain the size of the coupling capacitor.

[0003] like Figure 1 As shown, the sensing area is located in the middle of the fingerprint recognition chip, and the edge of the fingerprint recognition chip is other circuits ( Figure 1 The border part in the middle) and the electrode of the lead wire ( Figure 1 The circuits and electrodes at the edge are collectively referred to as edge conductors, which do not oscillate synchronously with the sensing area. When a finger touches the sensing area, the coupling capacitance between the sensing area and the finger is charged and discharged, and the coupling capacitance between the edge conductor and the sensing area also starts to charge and discharge. Figure 2 As shown in the figure, the coupling capacitance between different positions of the sensing area and the edge conductor is inconsistent. The coupling capacitance formed with the sensing area close to the edge conductor is large, and the coupling capacitance formed with the sensing area far from the edge conductor is small, resulting in inconsistent coupling capacitance data. The edge data in the collected fingerprint data has deviations, which affects the fingerprint recognition rate and the user experience. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, the first object of the present invention is to provide a fingerprint recognition module. The fingerprint recognition module can improve the consistency of the collected fingerprint data, thereby improving the fingerprint recognition rate and enhancing the user experience.

[0005] A second objective of the present invention is to provide a terminal device.

[0006] To achieve the above-mentioned purpose, the first aspect of the present invention proposes a fingerprint recognition module, comprising: a fingerprint recognition chip, the fingerprint recognition chip comprising a sensing area composed of a sensing unit array, when a user's finger touches the sensing unit, an oscillation excitation signal is applied to the fingerprint recognition chip, and a first coupling capacitor is formed between the user's finger and the sensing unit; an edge conductor, the edge conductor is arranged at the edge of the fingerprint recognition chip; a synchronization ring, the synchronization ring is located between the fingerprint recognition chip and the edge conductor, and is arranged around the sensing area to absorb the electric field generated by the sensing area at the edge.

[0007] The fingerprint recognition module of the embodiment of the present invention is provided with a synchronization ring surrounding the sensing area so as to absorb the electric field generated at the edge of the sensing area when an oscillation excitation signal is applied to the fingerprint recognition chip when the finger touches the sensing area. Thus, the consistency of the collected fingerprint data can be improved, and the fingerprint recognition rate can be improved, thereby enhancing the user experience.

[0008] In addition, the fingerprint recognition module according to the above embodiment of the present invention may also have the following additional technical features:

[0009] According to an embodiment of the present invention, the fingerprint recognition module further includes: a packaging structure, which surrounds the fingerprint recognition chip and is used to protect the fingerprint recognition chip.

[0010] According to an embodiment of the present invention, the material of the synchronization ring is the same as the material of the metal layer in the fingerprint recognition chip.

[0011] According to an embodiment of the present invention, the material of the synchronization ring includes aluminum, titanium, gold or copper.

[0012] According to an embodiment of the present invention, the width of the synchronization ring is greater than the side length of the induction unit.

[0013] According to an embodiment of the present invention, the width of the synchronization ring ranges from 100 to 300 μm.

[0014] According to an embodiment of the present invention, the synchronization ring is arranged in the fingerprint recognition chip.

[0015] According to an embodiment of the present invention, when an oscillation excitation signal is applied to the fingerprint recognition chip, the synchronization ring and the sensing area oscillate synchronously.

[0016] To achieve the above-mentioned purpose, an embodiment of the second aspect of the present invention proposes a fingerprint recognition module, comprising: a fingerprint recognition chip, to which an oscillation excitation signal is applied, the fingerprint recognition chip comprising a sensing area composed of an array of sensing units, when a user's finger touches the sensing unit, a first coupling capacitor is formed between the user's finger and the sensing unit; an edge conductor, the edge conductor is arranged at the edge of the fingerprint recognition chip; a synchronization ring, the synchronization ring is located between the fingerprint chip and the edge conductor, is arranged around the sensing area, and is used to absorb the electric field generated at the edge of the sensing area.

[0017] The fingerprint recognition module of the embodiment of the present invention can improve the consistency of the collected fingerprint data, thereby improving the fingerprint recognition rate and enhancing the user experience by arranging a synchronization ring surrounding the sensing area to absorb the electric field generated at the edge of the sensing area.

[0018] In addition, the fingerprint recognition module according to the above embodiment of the present invention may also have the following additional technical features:

[0019] According to an embodiment of the present invention, the synchronization ring and the sensing area oscillate synchronously.

[0020] Furthermore, the present invention provides a terminal device, comprising the fingerprint recognition module of the above embodiment of the present invention.

[0021] The terminal device of the embodiment of the present invention can collect fingerprint data with high consistency, thereby improving the fingerprint recognition rate and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a top view of a fingerprint recognition module in the related art;

[0023] Figure 2 is a schematic diagram of the electric field generated on the sensing area in the related art;

[0024] Figure 3 A top view of a fingerprint recognition module according to an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of an electric field generated on a sensing area according to an embodiment of the present invention;

[0026] Figure 5 is a top view of a fingerprint recognition module according to another embodiment of the present invention;

[0027] Figure 6 is a cross-sectional view of a fingerprint recognition module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0029] The fingerprint recognition module and terminal device according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0030] Figure 3 FIG. 1 is a schematic diagram of the structure of a fingerprint recognition module according to an embodiment of the present invention. Figure 3 As shown, the fingerprint recognition module 100 includes: a fingerprint recognition chip 110 , an edge conductor 120 and a synchronization ring 130 .

[0031] The fingerprint recognition chip 110 includes a sensing area 111 composed of a sensing unit array. When a user's finger touches the sensing unit, an oscillation excitation signal is applied to the fingerprint recognition chip 110, and a first coupling capacitor is formed between the user's finger and the sensing unit.

[0032] In one embodiment of the present invention, when the user's finger touches the sensing area 111, an oscillation excitation signal is applied to the fingerprint recognition chip 110, and the electric field lines generated in the sensing area 111 are as follows: Figure 4 shown.

[0033] The edge conductor 120 is disposed at the edge of the fingerprint recognition chip 110 .

[0034] Specifically, a second coupling capacitor is formed between the edge conductor 120 and the sensing region 111 .

[0035] The synchronization ring 130 is located between the fingerprint recognition chip 110 and the edge conductor 120 , and is disposed around the sensing area 111 , and is used to absorb the electric field generated at the edge of the sensing area 111 .

[0036] In an embodiment of the present invention, Figure 5 As shown, the fingerprint recognition module 100 may further include: a packaging structure 140 .

[0037] Among them, Figure 6 As shown, the packaging structure 140 surrounds the fingerprint recognition chip 110 and is used to package the fingerprint recognition chip 110 to protect the fingerprint recognition chip 110 .

[0038] In one embodiment of the present invention, the material of the synchronization ring 130 is the same as the material of the metal layer in the fingerprint recognition chip 110 .

[0039] Optionally, the material of the synchronizer ring 130 includes but is not limited to aluminum, titanium, gold or copper.

[0040] In one embodiment of the present invention, the width of the synchronization ring 130 is greater than the side length of the induction unit.

[0041] In one embodiment of the present invention, the width of the synchronization ring 130 ranges from 100 to 300 μm.

[0042] Optionally, in one embodiment of the present invention, the specification of the sensing unit may be 50 μm×50 μm, and the width of the synchronization ring 130 may be 200 μm.

[0043] It is understood that the width of the synchronizer ring 130 is half of the difference between the distance from the center of the synchronizer ring 130 to the side length of the outer pattern and the distance from the center to the side length of the inner pattern. For example, if the synchronizer ring 130 is a circular ring, the width of the synchronizer ring 130 is the outer circle radius minus the inner circle radius.

[0044] In the embodiment of the present invention, when an oscillation excitation signal is applied to the fingerprint recognition chip 110 , the synchronization ring 130 and the sensing area 111 oscillate synchronously.

[0045] In one embodiment of the present invention, the synchronization ring 130 may be disposed in the fingerprint recognition chip 110 to facilitate the manufacture of the fingerprint recognition module.

[0046] Specifically, when the user's finger touches the sensing area 111, the electric field lines generated on the sensing area 111 are as follows: Figure 4 As shown. The first coupling capacitor is mainly formed by the user's finger and the middle part of the sensing area 111, while the edge part of the sensing area 111, especially the sensing area 111 very close to the edge conductor 120, forms a second coupling capacitor with the edge conductor 120. If the sensing area 111 is not surrounded by the synchronization ring 130, the second coupling capacitor will affect the first coupling capacitor, thereby causing the collected fingerprint data to be inaccurate and the fingerprint recognition rate to be reduced.

[0047] In the embodiment of the present invention, after the synchronization ring 130 is arranged around the sensing area 111, the synchronization ring 130 absorbs the electric field generated by the sensing area 111 at the edge conductor 120. Thus, the distance between the sensing area 111 and the edge conductor 120 can be increased, and the second coupling capacitance between the two can be reduced, so as to reduce the influence of the second coupling capacitance on the first coupling capacitance, reduce the deviation of the edge part in the collected fingerprint data, and improve the consistency of the collected fingerprint data, thereby improving the fingerprint recognition rate and enhancing the user experience.

[0048] It should be noted that the synchronization ring 130 and the sensing area 111 oscillate synchronously, so the coupling capacitance formed between the synchronization ring 130 and the sensing area 111 is not charged, and has no effect on the coupling capacitance formed between the sensing area 111 and the finger.

[0049] The fingerprint recognition module of the embodiment of the present invention can improve the consistency of the collected fingerprint data, thereby improving the fingerprint recognition rate and enhancing the user experience by disposing a synchronization ring surrounding the sensing area to absorb the electric field generated at the edge of the sensing area.

[0050] The present invention further proposes a fingerprint recognition module. The fingerprint recognition module 200 includes: a fingerprint recognition chip 210 , an edge conductor 220 and a synchronization ring 230 .

[0051] An oscillation excitation signal is applied to the fingerprint recognition chip 210 , and the fingerprint recognition chip 210 includes a sensing area 211 composed of a sensing unit array. When a user's finger touches the sensing unit, a first coupling capacitor is formed between the user's finger and the sensing unit.

[0052] The edge conductor 220 is disposed at the edge of the fingerprint recognition chip 210 .

[0053] The synchronization ring 230 is located between the fingerprint recognition chip 210 and the edge conductor 220 , and is disposed around the sensing area 211 , and is used to absorb the electric field generated at the edge of the sensing area 211 .

[0054] In one embodiment of the present invention, the synchronization ring 230 and the sensing area 211 oscillate synchronously.

[0055] It should be noted that other specific implementations of the fingerprint recognition module of the embodiment of the present invention may be the same as the specific implementations of the fingerprint recognition module of the above-mentioned embodiment of the present invention, and will not be described here to reduce redundancy.

[0056] The fingerprint recognition module of the embodiment of the present invention is provided with a synchronization ring around the sensing area to absorb the electric field generated at the edge of the sensing area when an oscillation excitation signal is applied to the fingerprint recognition chip when the finger touches the sensing area, thereby improving the consistency of the collected fingerprint data, thereby improving the fingerprint recognition rate and enhancing the user experience. Furthermore, the present invention proposes a terminal device, including the fingerprint recognition module of the above embodiment of the present invention.

[0057] In one embodiment of the present invention, the terminal device includes but is not limited to a smart phone, a portable computer, a tablet computer or a fingerprint lock.

[0058] The terminal device of the embodiment of the present invention can collect fingerprint data with high consistency, thereby improving the fingerprint recognition rate and enhancing the user experience.

[0059] In addition, other structures and functions of the terminal device according to the embodiment of the present invention are known to ordinary technicians in the field and are not described here to reduce redundancy.

[0060] In the description of the present invention, it should be understood that the terms "center", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0062] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the present invention, unless otherwise clearly specified and limited, a first feature being “on” or “under” a second feature may mean that the first and second features are in direct contact with each other, or the first and second features are in indirect contact with each other through an intermediate medium.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0065] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A fingerprint recognition module, characterized in that: include: A fingerprint recognition chip, wherein the fingerprint recognition chip includes a sensing area composed of a sensing unit array. When a user's finger touches the sensing unit, an oscillation excitation signal is applied to the fingerprint recognition chip, and a first coupling capacitor is formed between the user's finger and the sensing unit; An edge conductor, wherein the edge conductor is arranged at an edge of the fingerprint recognition chip; A synchronization ring, the synchronization ring is located between the fingerprint recognition chip and the edge conductor, is arranged around the sensing area, and is used to absorb the electric field generated at the edge of the sensing area. The synchronization ring oscillates synchronously with the sensing area, and the width of the synchronization ring ranges from 100 to 300 μm; The fingerprint recognition module also includes: A packaging structure surrounds the fingerprint recognition chip and is used to protect the fingerprint recognition chip. The synchronization ring is arranged in the fingerprint recognition chip.

2. The fingerprint recognition module according to claim 1, characterized in that: The material of the synchronization ring is the same as the material of the metal layer in the fingerprint recognition chip.

3. The fingerprint recognition module according to claim 2, characterized in that: The material of the synchronizer ring includes aluminum, titanium, gold or copper.

4. The fingerprint recognition module according to claim 1, characterized in that: The width of the synchronization ring is greater than the side length of the induction unit.

5. The fingerprint recognition module according to claim 1, characterized in that: When an oscillation excitation signal is applied to the fingerprint recognition chip, the synchronization ring and the sensing area oscillate synchronously.

6. A fingerprint recognition module, characterized in that: include: A fingerprint recognition chip, to which an oscillation excitation signal is applied, wherein the fingerprint recognition chip comprises a sensing area composed of a sensing unit array, and when a user's finger touches the sensing unit, a first coupling capacitor is formed between the user's finger and the sensing unit; An edge conductor, wherein the edge conductor is arranged at an edge of the fingerprint recognition chip; A synchronization ring, the synchronization ring is located between the fingerprint recognition chip and the edge conductor, is arranged around the sensing area, and is used to absorb the electric field generated at the edge of the sensing area. The synchronization ring oscillates synchronously with the sensing area, and the width of the synchronization ring ranges from 100 to 300 μm; The fingerprint recognition module also includes: A packaging structure surrounds the fingerprint recognition chip and is used to protect the fingerprint recognition chip. The synchronization ring is arranged in the fingerprint recognition chip.

7. A terminal device, characterized in that: It comprises the fingerprint recognition module as described in any one of claims 1 to 6, or comprises the fingerprint recognition module as described in any one of claims 6.

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