Palm print recognition device with pressure induction

Abstract

The utility model discloses a palmprint recognition device with pressure induction, comprising a first substrate layer which is a flexible substrate; the palmprint recognition layer is arranged on the upper surface of the first substrate layer; the first pressure sensing layer is arranged on the lower surface of the first substrate layer; a second substrate layer; the second pressure sensing layer is arranged on the upper surface of the second substrate layer; and the flexible isolation layer is arranged between the first pressure sensing layer and the second pressure sensing layer, so that the first pressure sensing layer and the second pressure sensing layer jointly form a pressure sensing capacitor. The palmprint recognition device can improve the safety of palmprint recognition.

Description

Technical Field

[0001] The utility model relates to a palmprint recognition technology, in particular to a palmprint recognition device with pressure sensing. Background Art

[0002] With the rapid development of information technology, people pay more and more attention to the security of information. In real life, attendance at get off work, computer login, etc. all require accurate identification of people's identities. Among them, biometric technology has received more and more attention due to its reliability and convenience, and has been widely used in various identity authentication scenarios. The main biometric features currently used are divided into two categories: one is physiological features, such as fingerprints, palm prints, irises, faces, etc.; the other is behavioral features, such as signatures, voices, etc. Compared with other biometric technologies, palmprint recognition technology has the advantages of high accuracy, low equipment price, and easy use, so it has received more and more attention. With the continuous improvement and perfection of palmprint recognition technology, more and more palmprint recognition systems have been put into practical application.

[0003] Palmprint recognition is a biometric technology that identifies an individual by analyzing the texture features of their palm. Existing palmprint recognition devices mainly include optical and capacitive types. Optical palmprint recognition uses the image features of the palmprint to identify the individual, while capacitive palmprint recognition uses the capacitance changes caused by the valleys and ridges on the palmprint to identify the individual.

[0004] However, for optical palmprint recognition devices, they can be deceitfully cracked by using high-resolution palmprint images, and for capacitive palmprint recognition devices, they can be deceitfully cracked by using forged palmprint replicas, so the security of palmprint recognition devices needs to be further improved. Utility Model Content

[0005] In order to solve the above-mentioned deficiencies in the prior art, the utility model provides a palmprint recognition device with pressure sensing, which can improve the security of palmprint recognition.

[0006] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0007] A palmprint recognition device with pressure sensing, comprising:

[0008] A first substrate layer, wherein the first substrate layer is a flexible substrate;

[0009] A palmprint recognition layer, disposed on the upper surface of the first substrate layer;

[0010] A first pressure sensing layer, disposed on the lower surface of the first substrate layer;

[0011] a second substrate layer;

[0012] A second pressure sensing layer, disposed on the upper surface of the second substrate layer;

[0013] The flexible isolation layer is disposed between the first pressure sensing layer and the second pressure sensing layer, so that the first pressure sensing layer and the second pressure sensing layer together constitute a pressure sensing capacitor.

[0014] Furthermore, the first pressure sensing layer includes a plurality of first pressure sensing electrodes extending along the first direction and arranged in sequence along the second direction, and the second pressure sensing layer includes a plurality of second pressure sensing electrodes extending along the second direction and arranged in sequence along the first direction; each first pressure sensing electrode and each second pressure sensing electrode are interlaced with each other, and a corresponding pressure sensing capacitor is formed at each interlacing point.

[0015] Furthermore, the flexible isolation layer is OCA optical adhesive.

[0016] Furthermore, the first substrate layer is a PE film, a PET film, a PMMA film, a PI film or a PC film.

[0017] Furthermore, the second substrate layer is a rigid substrate.

[0018] Furthermore, the second substrate layer is a glass substrate, a composite board substrate or a sapphire substrate.

[0019] Furthermore, the second substrate layer is a flexible substrate.

[0020] Furthermore, the second substrate layer is a PE film, a PET film, a PMMA film, a PI film or a PC film.

[0021] Furthermore, the palmprint recognition device also includes a flexible circuit board, which has a first binding end, a second binding end, a third binding end and an external end. The flexible circuit board is bound and connected to the palmprint recognition layer through the first binding end, the flexible circuit board is bound and connected to the first pressure sensing layer through the second binding end, and the flexible circuit board is bound and connected to the second pressure sensing layer through the third binding end; the first binding end, the second binding end and the third binding end are all located on the same side of the flexible circuit board, and a bifurcated structure is formed between the three.

[0022] Furthermore, the palmprint recognition device also includes a control mainboard, and the flexible circuit board is electrically connected to the control mainboard via the external terminal.

[0023] The utility model has the following beneficial effects: the palm print recognition device of the utility model is integrated with a pressure sensing function, and pressure sensing recognition is also performed while performing palm print recognition. The palm pressure pattern of each person is unique, which can provide an additional biometric dimension for palm print recognition. When the palm pressure cannot be sensed during palm print recognition, or the sensed palm pressure pattern does not match the recognized palm print, palm print recognition cannot be passed, thereby improving the security of palm print recognition; and the palm print recognition layer and the first pressure sensing layer are respectively made on the two side surfaces of the first substrate layer, so there is no need to provide an additional substrate layer for the first pressure sensing layer, thereby reducing the number of substrate layers. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the stacking structure of the palmprint recognition device provided by the utility model.

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the first pressure sensing layer and the second pressure sensing layer in the palmprint recognition device provided by the utility model.

[0026] Figure 3 This is a schematic diagram of the planar structure of the flexible circuit board in the palmprint recognition device provided by the utility model. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, examples of the embodiments 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.

[0028] In the description of the present invention, it should be understood that the terms "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 accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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.

[0029] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" 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, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1

[0032] like Figure 1 As shown, a palmprint recognition device with pressure sensing includes:

[0033] A first substrate layer 20, wherein the first substrate layer 20 is a flexible substrate;

[0034] A palmprint recognition layer 10 is disposed on the upper surface of the first substrate layer 20;

[0035] A first pressure sensing layer 30 is disposed on the lower surface of the first substrate layer 20;

[0036] A second substrate layer 60;

[0037] The second pressure sensing layer 50 is disposed on the upper surface of the second substrate layer 60;

[0038] The flexible isolation layer 40 is disposed between the first pressure sensing layer 30 and the second pressure sensing layer 50 , so that the first pressure sensing layer 30 and the second pressure sensing layer 50 together constitute a pressure sensing capacitor.

[0039] When a palm acts on the palmprint recognition layer 10, since the first substrate layer 20 is a flexible substrate, the palm pressure can be transmitted to the first pressure sensing layer 30 through the first substrate layer 20, so that the first pressure sensing layer 30 compresses the flexible isolation layer 40 in the direction of the second pressure sensing layer 50, thereby changing the distance between the first pressure sensing layer 30 and the second pressure sensing layer 50; after the distance between the first pressure sensing layer 30 and the second pressure sensing layer 50 is changed, the pressure sensing capacitor jointly constituted by the two will discharge outward to form an induced current, and the control mainboard can identify the size of the palm pressure according to the size of the induced current.

[0040] The palmprint recognition device of the utility model is integrated with a pressure sensing function. While performing palmprint recognition, pressure sensing recognition is also performed. The palm pressure pattern of each person is unique, which can provide an additional biometric dimension for palmprint recognition. When the palm pressure cannot be sensed during palmprint recognition, or the sensed palm pressure pattern does not match the recognized palmprint, palmprint recognition cannot be passed, thereby improving the security of palmprint recognition. In addition, the palmprint recognition layer 10 and the first pressure sensing layer 30 are respectively made on the two side surfaces of the first substrate layer 20, so there is no need to provide an additional substrate layer for the first pressure sensing layer 30, thereby reducing the number of substrate layers.

[0041] In this embodiment, the palmprint recognition layer 10 may be an optical palmprint sensor array or a capacitive palmprint sensor array.

[0042] Preferably, the flexible isolation layer 40 is OCA optical adhesive.

[0043] The palmprint recognition device of the present invention adopts the OCA optical glue as the flexible isolation layer 40, which can not only realize the electrical isolation between the first pressure sensing layer 30 and the second pressure sensing layer 50, but also utilize the viscosity of the OCA optical glue to relatively fit and fix the first substrate layer 20 made of the first pressure sensing layer 30 and the second substrate layer 60 made of the second pressure sensing layer 50, thereby killing two birds with one stone.

[0044] The first substrate layer 20 may be, but is not limited to, a PE film, a PET film, a PMMA film, a PI film or a PC film.

[0045] like Figure 2 As shown, the first pressure sensing layer 30 includes a plurality of first pressure sensing electrodes 31 extending along the first direction and arranged in sequence along the second direction, and the second pressure sensing layer 50 includes a plurality of second pressure sensing electrodes 51 extending along the second direction and arranged in sequence along the first direction; each first pressure sensing electrode 31 and each second pressure sensing electrode 51 are interlaced with each other, and a corresponding pressure sensing capacitor is formed at each interlaced point.

[0046] The palmprint recognition device of the present invention adopts first pressure sensing electrodes 31 and second pressure sensing electrodes 51 distributed along the first direction and the second direction respectively, which are staggered to form a dot matrix distributed pressure sensing capacitor. Each pressure sensing capacitor can sense the palm pressure individually. The palm shape can be identified according to the position of each pressed pressure sensing capacitor, and the palm pressure distribution can be identified according to the distribution of the induced current size of each pressed pressure sensing capacitor.

[0047] Preferably, the first direction is perpendicular to the second direction.

[0048] The first pressure sensing electrode 31 and the second pressure sensing electrode 51 may be, but are not limited to, ITO electrodes, ZnO electrodes, Al 2 O 3 electrodes, and the like.

[0049] The second substrate layer 60 can be a rigid substrate or a flexible substrate. When the second substrate layer 60 is a rigid substrate, the palmprint recognition device can be set on a flat device (such as an electronic door lock, a check-in device, etc.) for palmprint and pressure recognition. When the second substrate layer 60 is a flexible substrate, the palmprint recognition device can be set on a curved device (such as a motorcycle handlebar, a car steering wheel, etc.) for palmprint and pressure recognition.

[0050] If the second substrate layer 60 is a rigid substrate, the second substrate layer 60 can be but is not limited to a glass substrate, a composite board substrate or a sapphire substrate, etc. If the second substrate layer 60 is a flexible substrate, the second substrate layer 60 can be but is not limited to a PE film, a PET film, a PMMA film, a PI film or a PC film, etc.

[0051] like Figure 1 and 3 As shown, the palmprint recognition device also includes a flexible circuit board 70, and the flexible circuit board 70 has a first binding end 71, a second binding end 72, a third binding end 73 and an external terminal 74. The flexible circuit board 70 is bound and connected to the palmprint recognition layer 10 through the first binding end 71, the flexible circuit board 70 is bound and connected to the first pressure sensing layer 30 through the second binding end 72, and the flexible circuit board 70 is bound and connected to the second pressure sensing layer 50 through the third binding end 73; the first binding end 71, the second binding end 72 and the third binding end 73 are all located on the same side of the flexible circuit board 70, and a bifurcated structure is formed between the three.

[0052] The palmprint recognition device further includes a control mainboard (not shown in the figure), and the flexible circuit board 70 is electrically connected to the control mainboard via the external connection terminal 74 .

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the utility model rather than to limit them. Although the embodiments of the utility model are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the utility model can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A palmprint recognition device with pressure sensing, characterized in that: include: A first substrate layer, wherein the first substrate layer is a flexible substrate; A palmprint recognition layer, disposed on the upper surface of the first substrate layer; A first pressure sensing layer, disposed on the lower surface of the first substrate layer; a second substrate layer; A second pressure sensing layer, disposed on the upper surface of the second substrate layer; The flexible isolation layer is disposed between the first pressure sensing layer and the second pressure sensing layer, so that the first pressure sensing layer and the second pressure sensing layer together constitute a pressure sensing capacitor.

2. The palmprint recognition device according to claim 1, characterized in that: The first pressure sensing layer includes a plurality of first pressure sensing electrodes extending along a first direction and arranged in sequence along a second direction, and the second pressure sensing layer includes a plurality of second pressure sensing electrodes extending along the second direction and arranged in sequence along the first direction; each first pressure sensing electrode and each second pressure sensing electrode are interlaced with each other, and a corresponding pressure sensing capacitor is formed at each interlaced point.

3. The palmprint recognition device according to claim 1, characterized in that: The flexible isolation layer is OCA optical adhesive.

4. The palmprint recognition device according to claim 1, characterized in that: The first substrate layer is a PE film, a PET film, a PMMA film, a PI film or a PC film.

5. The palmprint recognition device according to claim 1, characterized in that: The second substrate layer is a rigid substrate.

6. The palmprint recognition device according to claim 5, characterized in that: The second substrate layer is a glass substrate, a composite plate substrate or a sapphire substrate.

7. The palmprint recognition device according to claim 1, characterized in that: The second substrate layer is a flexible substrate.

8. The palmprint recognition device according to claim 7, characterized in that: The second substrate layer is a PE film, a PET film, a PMMA film, a PI film or a PC film.

9. The palmprint recognition device according to claim 1, characterized in that: The palmprint recognition device also includes a flexible circuit board, which has a first binding end, a second binding end, a third binding end and an external end. The flexible circuit board is bound and connected to the palmprint recognition layer through the first binding end, the flexible circuit board is bound and connected to the first pressure sensing layer through the second binding end, and the flexible circuit board is bound and connected to the second pressure sensing layer through the third binding end; the first binding end, the second binding end and the third binding end are all located on the same side of the flexible circuit board, and a bifurcated structure is formed between the three.

10. The palmprint recognition device according to claim 9, characterized in that: The palmprint recognition device further includes a control mainboard, and the flexible circuit board is electrically connected to the control mainboard via the external connection terminal.

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