CN209860960U - Electronic equipment with fingerprint identification module under screen - Google Patents

Abstract

The utility model provides an electronic equipment with fingerprint identification module under screen, it includes the touch screen and locates the fingerprint identification module under the touch screen, and the fingerprint identification module includes the camera and locates the adjustable lens module on the camera, and adjustable lens module can be according to the voltage control focus of inputing to it. The utility model discloses an electronic equipment with fingerprint identification module under screen has fingerprint identification automatic focusing, and the mounted position is limited little, fingerprint identification degree of accuracy height, the fast advantage of reaction.

Description

Electronic equipment with fingerprint identification module under screen

Technical Field

The utility model relates to a fingerprint identification technical field under the screen especially relates to an electronic equipment with fingerprint identification module under screen.

Background

The working principle of the optical fingerprint lens under the screen is as follows: when a finger is pressed on the fingerprint collector, the light is emitted to the finger by the internal light source, and is collected on the image sensor after being reflected by the finger, so that an image of the fingerprint is obtained, and the characteristic points of the fingerprint are extracted.

However, the depth of field of the existing optical fingerprint lens is short due to the limitation of the size, the depth of field of the lens is generally only 2-3mm, the distance between the under-screen fingerprint module and the screen during installation is strict, the distance is matched with the depth of field, and the tolerance must be +/-0.15 mm. The whole machine design is limited more, the requirement on the assembly precision is high, and the mobile phone film can also have great influence on fingerprint identification. Meanwhile, the optical fingerprint lens is difficult to extract fingerprint information on the side face of the finger, the extracted fingerprint features are few, the fingerprint identification accuracy is low, and the identification speed is slow.

SUMMERY OF THE UTILITY MODEL

In order to overcome not enough among the prior art, the utility model provides an electronic equipment with fingerprint identification module under screen, it has auto focus's characteristic, and the mounted position is limited little, and the fingerprint identification degree of accuracy is high, the reaction is fast.

Therefore, the purpose of the utility model is realized by the following technical scheme:

electronic equipment with fingerprint identification module under screen, include the touch-control screen and locate fingerprint identification module under the touch-control screen, the fingerprint identification module includes the camera and locates adjustable lens module on the camera, adjustable lens module can be according to the voltage control focus of inputing above that.

As a further optional scheme of the electronic device with the underscreen fingerprint identification module, the adjustable lens module includes a piezoelectric element, a glass film, a glass substrate, and an adjustable lens body, the adjustable lens body is clamped between the glass film and the glass substrate, the piezoelectric element is disposed on the glass film, and the piezoelectric element can drive the adjustable lens body to generate corresponding spherical deformation through the glass film.

As a further optional scheme of the electronic device with the fingerprint identification module under the screen, the piezoelectric element is a piezoelectric ceramic film, and a circular through hole is formed in the piezoelectric ceramic film.

As a further alternative of the electronic device with the underscreen fingerprint identification module, the piezoelectric element may drive the adjustable lens body to deform concavely and convexly.

As a further optional solution of the electronic device with the fingerprint recognition module under the screen, the adjustable lens module further includes a lens carrier, the piezoelectric element and the glass substrate are connected to the lens carrier, and the lens carrier is connected to the camera.

As a further optional solution of the electronic device with the underscreen fingerprint identification module, a snap connection is formed between the lens carrier and the camera.

As a further optional solution of the electronic device with the underscreen fingerprint identification module, the fingerprint identification module includes a plurality of the adjustable lens modules, and the plurality of the adjustable lens modules are arranged in a stacked manner in the axial direction of the camera.

As a further alternative of the electronic device with the underscreen fingerprint identification module, the voltage on each of the adjustable lens modules may be independently adjustable.

As a further optional solution of the electronic device with the underscreen fingerprint identification module, the camera further includes a circuit board, and the circuit board is used for controlling the camera to work and inputting a control voltage for the adjustable lens module.

As a further optional scheme of the electronic device with the underscreen fingerprint identification module, the camera further includes a lens, an imaging element and an optical filter, the adjustable lens module is disposed on the lens, the optical filter is disposed between the imaging element and the lens, and the imaging element and the circuit board are electrically connected.

The utility model discloses an electronic equipment with fingerprint identification module under screen has following beneficial effect at least:

the fingerprint identification module includes the camera and locates the adjustable lens module on the camera, and adjustable lens module can be according to the voltage control focus of inputing to it above that. From this for the fingerprint identification module becomes a module of making a video recording of zooming, can obtain more clear fingerprint image through zooming, promotes fingerprint identification's rate of accuracy. Meanwhile, on the premise of obtaining a clearer fingerprint image, the calculation amount of the electronic equipment can be reduced, and the matching type identification of the fingerprint can be carried out more quickly. The fingerprint identification module added with the adjustable lens module has the function of automatic focusing, so that the distance from the fingerprint identification module to a touch screen is not limited during installation, the structural design freedom degree is large, and the assembly precision requirement is low; the fingerprint identification rate is not influenced by the change of the touch screen, such as film sticking; the electronic equipment is provided with the fingerprint identification automatic focusing function, the installation position is limited to be small, the fingerprint identification accuracy is high, and the response is fast.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic view illustrating a front view structure of an electronic device having an underscreen fingerprint identification module according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional structure diagram of an electronic device with an underscreen fingerprint identification module according to an embodiment of the present invention;

fig. 3 is a schematic view illustrating an axial structure of a fingerprint identification module according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating a partially exploded structure of a fingerprint identification module according to an embodiment of the present invention;

fig. 5 is a schematic cross-sectional view illustrating a fingerprint identification module according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a fingerprint identification module according to an embodiment of the present invention in a normal state;

fig. 7 is a schematic structural diagram illustrating a convex deformation of a fingerprint identification module according to an embodiment of the present invention;

fig. 8 shows a schematic structural diagram of concave deformation of the fingerprint identification module according to an embodiment of the present invention.

Description of the main element symbols:

100-touch screen; 200-fingerprint identification module; 210-a camera; 211-a circuit board; 212-lens; 213-an imaging element; 214-a filter; 215-lens carrier; 220-a tunable lens module; 221-a piezoelectric element; 222-a glass film; 223-a glass substrate; 224-a tunable lens body; 225-lens carrier.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Examples

The utility model provides an electronic equipment with fingerprint identification module under screen, hereinafter be referred to as "electronic equipment" for short. The electronic device may be, but is not limited to, a device configured with a display screen for a mobile phone, a tablet computer, a computer, and the like. Through setting up the fingerprint identification module under the screen, can make electronic equipment's display screen have the screen of bigger and account for than.

Referring to fig. 1-2, the electronic device includes a touch screen 100 and a fingerprint identification module 200 disposed under the touch screen 100. The touch screen 100 is a display output device and a touch input device, and is a human-computer interaction terminal of an electronic device. Through configuring the fingerprint identification module 200, the electronic device can be authenticated through the touch screen 100, so as to perform authorization operations such as unlocking and transaction.

As shown in fig. 3-4, the fingerprint recognition module 200 includes a camera 210 and an adjustable lens module 220 disposed on the camera 210, and the adjustable lens module 220 can adjust a focal length according to a voltage input thereto. From this for fingerprint identification module 200 becomes a module of making a video recording of zooming, can obtain more clear fingerprint image through zooming, promotes fingerprint identification's rate of accuracy. Meanwhile, on the premise of obtaining a clearer fingerprint image, the calculation amount of the electronic equipment can be reduced, and fingerprint matching type identification can be carried out more quickly.

In this embodiment, the electronic device is a mobile phone. The touch screen 100 may be an OLED screen, which has a self-luminous characteristic, and can illuminate a finger area, and a reflected light of an illuminated fingerprint returns to the fingerprint recognition module 200 through a gap between pixels of the screen for imaging. Fingerprint camera 210 of fingerprint identification module 200 can select for use present optical type screen fingerprint camera down. Zoom to camera 210 through newly-increased adjustable lens module 220 for the image that camera 210 obtained is clearer, and fingerprint identification module 200 has autofocus's effect.

The adjustable lens module 220 may be directly selected from the tles (tunable lens) manufactured by the manufacturer poilight, and the tles is disposed on the camera 210. TLens can produce different focal lengths with different input voltages, thereby achieving the zooming/focusing effect.

The voltage of the adjustable lens module 220 can be controlled by the control voltage of the camera 210, i.e. the adjustable lens module 220 and the camera 210 are controlled in an integrated manner; the adjustable lens module 220 and the camera 210 can also be connected to the main board of the mobile phone, and are independently controlled. The integration or independent control of tunable lens module 220 may be selected based on cost, performance requirements, and the like.

The Tlens has the characteristics of small size and quick focusing, can record a plurality of images by matching with an image algorithm, combines the images into a full focus image, easily realizes that the whole picture is clear, is very suitable for the optical requirements of underscreen fingerprint identification, can extract more fingerprint information and improves the identification success rate of optical fingerprints.

As shown in fig. 5 to 8, the tunable lens module 220 includes a piezoelectric element 221, a glass film 222, a glass substrate 223, and a tunable lens body 224, wherein the tunable lens body 224 is sandwiched between the glass film 222 and the glass substrate 223, the piezoelectric element 221 is disposed on the glass film 222, and the piezoelectric element 221 can drive the tunable lens body 224 to generate a corresponding spherical deformation through the glass film 222.

The piezoelectric element 221 can deform in accordance with the magnitude of the input voltage, that is, the larger the input voltage, the larger the deformation. The adjustable lens body 224 is a deformable transparent object that is spherically deformed to have different curvatures to achieve adjustment of the degree of focus or divergence. The adjustable lens body 224 may be a soft lens, made of silicone rubber, and has the advantages of soft texture, good mechanical elasticity, and durability.

In a normal state, the glass film 222 and the glass substrate 223 are both flat, the glass film 222 and the glass substrate 223 are arranged in parallel, the adjustable lens body 224 is sandwiched between the two and is flat, and at this time, the adjustable lens body 224 has no zooming effect. The glass substrate 223 has a supporting effect on the tunable lens body 224, and the glass film 222 has a force transmitting and protecting effect on the tunable lens body 224. When the piezoelectric element 221 is deformed, the glass film 222 transmits a force to the tunable lens body 224, so that the tunable lens body 224 is deformed on the glass film 222 side and is always flat on the glass substrate 223 side. Therefore, the adjustable lens body 224 can be curved and flat, and light rays are transmitted by diverging or converging on the glass film 222 side and pass out of the camera 210 on the glass substrate 223 side in a straight manner.

It can be understood that the glass film 222 and the glass substrate 223 are both sheet-shaped bodies with high permeability, which may be transparent bodies or filter bodies with certain filtering effect. The thickness of the glass substrate 223 is ensured to be able to withstand the force generated by the piezoelectric element 221 when deformed without deformation (almost without deformation), and the thickness of the glass film 222 is ensured to be able to deform accordingly when the piezoelectric element 221 is deformed correspondingly, so as to transmit the pressure of the piezoelectric element 221 to the tunable lens body 224.

The piezoelectric element 221 is a piezoelectric ceramic film, a circular through hole is formed in the piezoelectric ceramic film, and the piezoelectric ceramic film floats on the outer edge of the circular through hole, so that the glass film 222 deforms correspondingly, and due to the existence of the circular hole, the deformation generated by the glass film 222 is spherical deformation, namely, the deformation of the adjustable lens body 224 is spherical deformation all the time. Because the diameter of the circular through hole is kept unchanged all the time, the larger the floating/deformation amount of the piezoelectric ceramic film is, the larger the curvature of the adjustable lens is, and the larger the zoom magnification is.

In other embodiments, the tunable lens module 220 may further include a plurality of piezoelectric elements 221, the plurality of piezoelectric elements 221 are distributed in a ring shape, and the ring-shaped piezoelectric elements 221 can drive the glass film 222 to deform in a curved surface when deforming, so as to drive the tunable lens body 224 to deform in a curved surface.

In this embodiment, the piezoelectric element 221 can drive the tunable lens body 224 to generate concave deformation and convex deformation. The glass film 222 is connected to the piezoelectric element 221 and the tunable lens body 224 on both sides, and the glass film 222 is connected to the glass substrate 223 on both sides of the tunable lens body 224. The piezoelectric element 221 can generate deformations in different directions by applying currents/voltages in different directions, and can generate deformations in different degrees by applying currents/voltages in different magnitudes, thereby further increasing the flexibility of auto-focusing of the fingerprint recognition module 200.

As shown in fig. 6, the piezoelectric element 221, the glass thin film 222, the tunable lens body 224, and the glass substrate 223 are sequentially disposed from top to bottom. As shown in fig. 7, when the piezoelectric element 221 is deformed downward, the glass film 222 is pressed downward, so that the edge of the adjustable lens body 224 is deformed downward and the center is arched upward, thereby forming a plano-convex lens. When the piezoelectric element 221 is deformed upward, the glass film 222 is pulled upward, so that the edge of the tunable lens body 224 is deformed upward and the center is depressed downward, thereby forming a plano-concave lens, as shown in fig. 8.

Tunable lens module 220 further includes a lens carrier 225, a piezoelectric element 221 and a glass substrate 223 attached to lens carrier 225, and lens carrier 225 attached to camera head 210. One end of the piezoelectric element 221 is connected to the lens carrier 225 and fixed, so that when the piezoelectric element 221 is deformed, the deformation amount can be effectively transmitted to the glass film 222. The fixation of the glass substrate 223 on the lens carrier 225 enables the glass substrate 223 to form an effective support for the tunable lens body 224. The distance between the fixed end of the piezoelectric element 221 and the glass substrate 223 is kept fixed, so that the tunable lens body 224 can generate effective curved surface deformation when the piezoelectric element 221 deforms. The piezoelectric element 221 is capable of causing a change in the focus of the lens 212 of the adjustable lens body 224 within 1 ms.

A snap connection is formed between the lens carrier 225 and the camera head 210. The snap connection makes assembly between the adjustable lens module 220 and the camera 210 more convenient on the one hand; on the other hand, the piezoelectric element 221 and the piezoelectric element are connected without arranging other connecting parts, and meanwhile, because the connecting parts are usually metal pieces, the use of metal connecting pieces is omitted, and the interference or shielding of the metal connecting pieces on the electrical transmission of the piezoelectric element 221 is avoided.

In other embodiments, the fingerprint recognition module 200 has a plurality of adjustable lens modules 220, the plurality of adjustable lens modules 220 are stacked in the axial direction of the camera 210, and the voltage on each adjustable lens module 220 can be independently adjusted. By stacking a plurality of adjustable lens modules 220, fingerprint identification module 200 can have a higher zoom magnification. The zoom magnification of each adjustable lens module 220 can be independently adjusted, so that each adjustable lens module 220 can be a same type of lens with different zoom magnifications or different types of lenses, and the fingerprint identification module 200 can have better and more flexible zoom/auto-focus characteristics. It is understood that multiple adjustable lens modules 220 may be mounted using one lens carrier 225, or each using one lens carrier 225.

In this embodiment, the camera 210 further includes a circuit board 211, and the circuit board 211 is configured to control the operation of the camera 210 and input a control voltage to the adjustable lens module 220. That is, the adjustable lens module 220 and the camera 210 are integrally controlled, and the focal length adjustment of the adjustable lens module 220 and the imaging control of the camera 210 are performed by using the unified circuit board 211, so that the zooming of the adjustable lens module 220 can be well controlled by the imaging of the camera 210.

The camera 210 further includes a lens 212, an imaging device 213 and a filter 214, the adjustable lens module 220 is disposed on the lens 212, the filter 214 is disposed between the imaging device 213 and the lens 212, and the imaging device 213 is electrically connected to the circuit board 211. The image passes through the tunable lens module 220, the lens 212, and the filter 214, and then is imaged on the imaging element 213 (which may be a CMOS).

The camera 210 further includes a lens carrier 215, the circuit board 211 is connected to a lower surface of the lens carrier 215, the imaging element 213 is electrically connected to the circuit board 211, the filter 214 is connected to a groove of an upper surface of the lens carrier 215, the lens 212 is connected to the upper surface of the lens carrier 215, and the adjustable lens module 220 is connected to the lens 212 through the lens carrier 225. The circuit board 211 may be a wire or a contact type conductive contact for supplying power to the adjustable lens module 220, that is, the piezoelectric element 221, by the circuit board 211, that is, a conductive element electrically connected to the circuit board 211 is embedded in the housing of the lens 212, and the conductive contact is exposed at the end of the lens 212, and the conductive contact of the piezoelectric element 221 is exposed from the lens carrier 225, so that when the lens carrier 225 is connected to the lens 212, the piezoelectric element 221 and the circuit board 211 are electrically connected.

Above-mentioned, the electronic equipment that has fingerprint identification module under screen of this embodiment has following technological effect:

1. instant focusing-multiple images can be recorded, combined into a full-focus image, instant focusing transcends competitive technology. The recognition speed of the fingerprint recognition module 200 with TLens is 10 times faster than that of the VCM (voice coil motor) fingerprint recognition lens 212.

2. Constant field-providing smooth and accurate focus when recording images-unlike VCM, the zooming effect is not visible when the focal length is varied, and constant field significantly reduces the complexity of image stitching and bracketing.

3. High optical axis stability-a feature of the TLens design, unlike VCM, it is immune to gravity, thermal and mechanical shock. Thus, no complex calibration procedure is required and the adjustable lens body 224 performs stably over its lifetime, making the manufacturing process less complex and providing higher image quality over time. From an application point of view, this significantly reduces the complexity of image stitching and wrapping.

4. Very low power consumption-an important quality for new applications in smart phones and wearable devices and in industry applications where low power consumption is required-the low power consumption of tlesns also means that, unlike VCM, the temperature of the image sensor will remain stable at focus, thereby improving image quality.

5. The entire module is easily integrated into an electronic device-because of the small size of the TLens, a fingerprint identification module 200 configured with the TLens can be more easily adapted to the compact design of an electronic device, such as a mobile phone.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. Electronic equipment with fingerprint identification module under screen, its characterized in that includes the touch-control screen and locates fingerprint identification module under the touch-control screen, the fingerprint identification module includes the camera and locates adjustable lens module on the camera, adjustable lens module can be according to the voltage control focus of inputing to it above that.

2. The electronic device with the underscreen fingerprint identification module according to claim 1, wherein the tunable lens module comprises a piezoelectric element, a glass film, a glass substrate, and a tunable lens body, the tunable lens body is sandwiched between the glass film and the glass substrate, the piezoelectric element is disposed on the glass film, and the piezoelectric element can drive the tunable lens body to generate a corresponding spherical deformation through the glass film.

3. The electronic device with the underscreen fingerprint identification module of claim 2, wherein the piezoelectric element is a piezoelectric ceramic film, and a circular through hole is formed in the piezoelectric ceramic film.

4. The electronic device with the underscreen fingerprint identification module of claim 3, wherein the piezoelectric element is capable of driving the tunable lens body to deform concavely or convexly.

5. The electronic device with an underscreen fingerprint identification module of claim 2, wherein the adjustable lens module further comprises a lens carrier, the piezoelectric element and the glass substrate being coupled to the lens carrier, the lens carrier being coupled to the camera.

6. The electronic device with the underscreen fingerprint identification module of claim 5, wherein a snap connection is formed between the lens carrier and the camera.

7. The electronic device with the underscreen fingerprint identification module of any one of claims 1-6, wherein the fingerprint identification module comprises a plurality of the adjustable lens modules, and the plurality of adjustable lens modules are arranged in a stacked manner in an axial direction of the camera.

8. The electronic device with an underscreen fingerprint identification module of claim 7, wherein a voltage across each of the tunable lens modules is independently adjustable.

9. The electronic device with the underscreen fingerprint identification module of any one of claims 1-6, wherein the camera further comprises a circuit board configured to control operation of the camera and input a control voltage for the adjustable lens module.

10. The electronic device with the underscreen fingerprint identification module of claim 9, wherein the camera further comprises a lens, an imaging element, and an optical filter, the adjustable lens module is disposed on the lens, the optical filter is disposed between the imaging element and the lens, and the imaging element is electrically connected to the circuit board.