CN112668568A - Image acquisition device, positioning method thereof and electronic equipment - Google Patents

Abstract

The application provides an image acquisition device, a positioning method thereof and electronic equipment, and relates to the technical field of display devices. The image acquisition device comprises an image sensor, an angle sensor and a driving mechanism, wherein the image sensor is used for setting a fingerprint identification area below the display screen, the angle sensor and the driving mechanism are coaxially arranged with the image sensor, the image sensor and the angle sensor are coaxially rotated on a plane parallel to the display screen under the driving of the driving mechanism, and the image sensor is a fingerprint image sensor and is used for acquiring a fingerprint image of a finger above the display screen through the display screen.

Description

Image acquisition device, positioning method thereof and electronic equipment

Technical Field

The application relates to the technical field of display devices, in particular to an image acquisition device, a positioning method thereof and electronic equipment.

Background

With the increasingly powerful functions of electronic devices such as mobile phones and tablet computers, higher and higher requirements are also put forward on the implementation effects of operations such as photographing and fingerprint identification as important auxiliary functions in the electronic devices. For example, the function of shooing of cell-phone except that the definition that constantly requires to shoot the image improves, also requires to have positive integration auto heterodyne function under the screen, for example fingerprint identification module again, also requires to provide accurate, quick fingerprint identification at the display surface to improve electronic equipment's user experience.

Taking optical fingerprint identification integrated under a screen of an electronic device as an example, the optical fingerprint identification generally comprises an image sensor arranged under the screen on the front side, a finger covers an area of the screen corresponding to the image sensor, the finger irradiates a fingerprint and reflects the fingerprint through a light source of a display screen, and reflected light carrying specific biological characteristic information is received, recorded or analyzed by the image sensor, so that the function of recording the biological characteristic information or identifying the specific biological characteristic information is achieved.

The image sensor is usually arranged at a certain preset position in a display area under the display screen, because the pixel arrangement of the display screen is usually different from the pixel arrangement of the image sensor, the image sensor acquires an image through the display screen, the acquired image can have colorful high-frequency irregular stripes, which are called moire fringes, and the moire fringes can cause the image quality of the acquired image to be interfered. Since moire fringes are generated irregularly, there is usually no obvious shape regularity, but when the image sensor is rotated in parallel under the display screen, the moire fringes can change along with the change of the rotation angle between the image sensor and the display screen, and usually within the rotation range of 360 degrees, an angle position with the lightest moire fringes can be found, and the image sensor and the display screen are kept at the angle position to form the best imaging quality.

In the prior art, a sample of an image sensor is generally arranged on a rotating table positioned below a display screen, and the condition of moire fringes in images of the image sensor at various angles is rotated and observed through manual operation, so that the angle position with the lightest moire fringes is determined, and subsequent reprinting is performed. Such an operation is time consuming to adjust and may result in severe moir é in the final product even if the design and adjustment are accurate in the early stages, since other errors may occur during the actual machining and assembly.

Disclosure of Invention

The present application provides an image capturing device, a positioning method thereof, and an electronic apparatus, where the image capturing device can be integrated in the electronic apparatus, and directly adjust and calibrate an angular position of a plane rotation in the electronic apparatus and position the plane rotation, so that the influence of moire on an imaging quality of the image capturing device can be reduced by adjustment, and an imaging accuracy of the image capturing device is improved.

The embodiment of the application is realized as follows:

in one aspect of the embodiment of the application, an image acquisition device is provided, including being used for setting up the image sensor in the fingerprint identification area of display screen below, still include angle sensor and actuating mechanism with the coaxial setting of image sensor, under actuating mechanism's drive, image sensor and angle sensor rotate at the plane that is on a parallel with the display screen is coaxial, and image sensor is fingerprint image sensor for see through the fingerprint image that the display screen obtained the finger above the display screen.

Optionally, the image acquisition device of this application embodiment still includes the circuit board of setting in the display screen below, and image sensor sets up on the circuit board, and the fingerprint image that image sensor acquireed transmits to the circuit board.

Optionally, the angle sensor is a potentiometer.

Optionally, the angle sensor is a gyroscope.

Optionally, the drive mechanism is a rotary electric machine.

Optionally, the rotating electrical machine is a stepper motor.

Optionally, the backside of the circuit board is provided with a reinforcing sheet.

Optionally, the image sensor, the angle sensor and the driving mechanism are fixed by pasting.

Optionally, a heat dissipation structure is further disposed between the driving mechanism and the circuit board.

Optionally, the heat dissipation structure comprises a thermally conductive silicone layer.

Optionally, the image acquisition device of the embodiment of the application further includes a controller, the controller is electrically connected to the image sensor, the angle sensor, and the driving mechanism, and when the image acquisition device further includes a circuit board, the controller is further electrically connected to the circuit board.

Alternatively, a rotation start position of the image sensor is preset on a rotation path of the driving mechanism, and the controller may control the driving mechanism to drive the image sensor to rotate to the rotation start position.

Optionally, a limiting member is further disposed on the rotation path of the driving mechanism, and the limiting member is used for limiting the rotation position of the driving mechanism.

Optionally, the controller and the image sensor, the controller and the angle sensor, and the controller and the driving mechanism are electrically connected through coaxial cables, respectively.

In another aspect of the embodiments of the present application, an electronic device is provided, which includes a display screen and an image capturing device according to any one of the foregoing items, where the image capturing device is disposed below the display screen.

In another aspect of the embodiments of the present application, a method for positioning an image capturing device is provided, where the method includes: the driving mechanism drives the image sensor and the angle sensor to coaxially rotate; the method comprises the steps that an image sensor obtains external image information through a display screen according to a preset frequency, and an angle sensor obtains rotation angle information of a driving mechanism corresponding to the external image information shooting position according to the same preset frequency; analyzing the obtained external image information to obtain external image information with the lowest moire degree, determining the external image information as optimal image information, and matching rotation angle information corresponding to the optimal image information as an optimal angle; the driving mechanism drives the image sensor and the angle sensor to coaxially rotate to an optimal angle.

Optionally, analyzing the obtained external image information to obtain external image information with the lowest moire degree, determining the external image information as optimal image information, and matching the rotation angle information corresponding to the optimal image information as an optimal angle includes: comparing the current external image information with the previous external image information, and reserving the external image information with lower moire degree obtained by comparison; acquiring next external image information under a preset frequency, comparing the next external image information with the external image information with lower retained moire degree, and retaining the external image information with lower moire degree obtained by comparison; and when the rotation angle information reaches a preset maximum angle value, determining the currently reserved external image information with lower moire degree as the optimal image information, and matching the rotation angle information corresponding to the optimal image information as the optimal angle.

Optionally, a rotation initial position of the image sensor is preset on a rotation path of the driving mechanism; before the driving mechanism drives the image sensor, the circuit board and the angle sensor to coaxially rotate, the method further comprises the following steps: the driving mechanism drives the image sensor and the angle sensor to coaxially rotate to a rotation initial position, and the rotation angle information of the angle sensor is reset to zero.

Optionally, the preset maximum angle value is 360 ° or 180 °.

The embodiment of the application provides an image acquisition device, a positioning method thereof and electronic equipment, wherein the image acquisition device comprises an image sensor arranged below a display screen and used for acquiring an external image through the display screen, and also comprises an angle sensor and a driving mechanism which are coaxially arranged with the image sensor, the angle sensor and the driving mechanism are coaxially arranged, the image sensor and the angle sensor are coaxially rotated in a plane parallel to the display screen under the driving of the driving mechanism, in the rotating process, through the analysis of the external image acquired through the display screen at each position on a rotating path, an image with the minimum influence of Moire patterns on the image in the external image at each position on the whole rotating path can be obtained, the image is determined to be a required optimal image, and then the image acquisition device is rotated to a rotating position corresponding to the optimal image through the driving mechanism for positioning, therefore, the image acquisition device can be accurately positioned at the position where the influence of the moire fringes on the image is minimum under the screen, the image acquisition device is used as a fingerprint identification device in the electronic equipment, the image sensor is a fingerprint image sensor and is arranged in a fingerprint identification area under the display screen, the fingerprint image of the finger above the display screen is acquired through the display screen, the influence of the moire fringes is eliminated as far as possible through the adjustment of the rotation position, and the accuracy of the fingerprint image of the fingerprint identification is higher.

Drawings

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

Fig. 1 is a schematic structural diagram of an image capturing apparatus according to an embodiment of the present disclosure;

FIG. 2 is a top view of FIG. 1;

fig. 3 is a second schematic structural diagram of an image capturing apparatus according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;

fig. 5 is a flowchart of a positioning method of an image capturing apparatus according to an embodiment of the present disclosure;

fig. 6 is a second flowchart of a positioning method of an image capturing apparatus according to an embodiment of the present disclosure;

fig. 7 is a third flowchart of a positioning method of an image capturing apparatus according to an embodiment of the present disclosure.

Icon: 10-a display screen; 20-a circuit board; 21-an image sensor; 30-an angle sensor; 40-a drive mechanism; 50-reinforcing sheet; 60-a controller; 70-coaxial cable.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed" and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In an electronic device, an image capturing apparatus in the prior art is generally disposed at a predetermined position in a display area under a display screen, where the specific position is subject to an image capturing function that the image capturing apparatus needs to implement. For example, the image capturing device may be a front camera disposed below the display screen of the electronic device, and is configured on the display side of the display screen of the electronic device to capture an external image through the display screen, or for example, the image capturing device may also be a fingerprint recognition device configured at a fixed position on the display screen of the electronic device, and when a human body part such as a finger with specific biometric information is attached to the fixed position on the display screen, the image attached to the display screen may be captured by the fingerprint recognition device, so as to extract and recognize the specific biometric information in the image.

The following description will be given taking a fingerprint recognition device as an image acquisition device as an example.

When the image acquisition device is used for fingerprint identification on the display side of the electronic equipment, the image acquisition device needs to be arranged below the display screen and is usually positioned in the display area, the pixel arrangement of the display area of the display screen is different from the pixel arrangement of the image sensor in the image acquisition device, and the image quality of an image acquired by the image sensor through the display screen is interfered by waves (moire) with different frequencies, so that the accuracy of fingerprint identification is greatly influenced. Because the size of the moire pattern can be changed along with the angle relation of the relative rotation of the plane between the image sensor and the display screen, an angle with the lowest moire pattern degree can be found on the path of the relative angle rotation between the image sensor and the display screen, and the image acquisition device is rotated to the angle with the lowest moire pattern degree, so that the imaging quality of the image acquired by the image acquisition device in the practical use of the electronic equipment can be optimal.

In the prior art, it is usually necessary to rotate the rotary table by disposing a sample of the image acquisition device on the rotary table, disposing a display screen of the electronic equipment to be mounted on the image acquisition device, and then operating the rotary table to rotate, continuously acquiring images at various angular positions in the rotating process, comparing the images with the lowest moire degree to obtain the angular position of the image with the lowest moire degree in the rotating range of 0-360 degrees of the rotating table, and subsequently installing the image acquisition device in the electronic equipment, that is, the electronic device is mounted at the angular position, but since the assembly and processing of the electronic device itself include a plurality of steps, precision errors are inevitably generated during the assembly process, resulting in a difference between the designed installation state and the actual installation state, and once such a difference is generated, it is difficult to ensure that the image capturing device in the mounted electronic apparatus is in a position with better imaging quality.

An image capturing device is provided in an embodiment of the present application, fig. 1 is a schematic structural diagram of the image capturing device provided in the embodiment of the present application, fig. 2 is a top view of fig. 1, and adisplay screen 10 is hidden in fig. 2 for clarity of view and avoiding occlusion. As shown in fig. 1 in combination with fig. 2, the image capturing apparatus according to the embodiment of the present application includes animage sensor 21 disposed below thedisplay screen 10, theimage sensor 21 being configured to capture an external image through thedisplay screen 10, anangle sensor 30 disposed coaxially with theimage sensor 21, and adriving mechanism 40, and theimage sensor 21 and theangle sensor 30 are coaxially rotated in a plane parallel to thedisplay screen 10 by thedriving mechanism 40.

As shown in fig. 1 and fig. 2, theimage sensor 21, theangle sensor 30 and thedriving mechanism 40 are coaxially arranged, thedriving mechanism 40 drives theimage sensor 21 and theangle sensor 30 to rotate together, the rotation direction of thedriving mechanism 40 is parallel to the plane of thedisplay screen 10, the rotation angle of thedriving mechanism 40 can be recorded by theangle sensor 30, since the rotation direction is parallel to the plane of thedisplay screen 10, the image capturing device arranged under thedisplay screen 10 only rotates relative to thedisplay screen 10 and does not move relative position, thus, the image capturing device can always capture external image information through thedisplay screen 10, during the rotation process, the image capturing device constantly captures image information at each angle in the current state, meanwhile, theangle sensor 30 also records the rotation angle in the current state, at each rotation angle, the rotation angle is matched with the image information, all the acquired image information can be compared under the rotation path of 0-360 degrees, and the image information with the lowest moire degree in the range of 0-360 degrees of the whole rotation can be obtained by comparing the moire condition on the image information under each angle, and the rotation angle at which the image information with the lowest moire degree is acquired is obtained. At this time, as long as thedriving mechanism 40 drives theimage sensor 21 and theangle sensor 30 to rotate to the rotation angle position where the image information with the lowest moire degree is located again and is fixed and does not rotate any more, the image acquisition device acquires an external image under thedisplay screen 10, that is, the influence of moire can be avoided to the greatest extent, and a better image quality is presented.

Illustratively, as shown in fig. 1 and 2, in the present embodiment, the image capturing apparatus further includes acircuit board 20 disposed below thedisplay screen 10, theimage sensor 21 is disposed on thecircuit board 20, and an external image captured by theimage sensor 21 is transmitted to the circuit board. That is, theimage sensor 21 and thecircuit board 20 constitute an image acquisition module, or an optical element above theimage sensor 21 is included to constitute an image acquisition module together, the optical element senses an optical signal, theimage sensor 21 is used for acquiring an image, thecircuit board 20 receives the acquired image and when thecircuit board 20 has a processing operation or a storage function, thecircuit board 20 can process, operate or store the image acquired by theimage sensor 21.

It should be noted that, in the embodiment of the present application, the implementation form of theCircuit Board 20 is not particularly limited, and theCircuit Board 20 may be a Printed Circuit Board (PCB), and those skilled in the art will understand that, as a support of the electronic component and a carrier for implementing the electrical connection, the Printed Circuit Board is generally referred to as a rigid Printed Board structure. TheCircuit board 20 may also be a Flexible Printed Circuit (FPC), which is a Circuit board made of polyimide or polyester film as a base material and having excellent flexibility and reliability, and the Flexible Circuit board has high wiring density, light weight, and thin thickness, and can have Flexible bending performance within a certain degree. In the embodiment of the present invention, specific structural forms and parameter settings of theimage sensor 21 are not specifically limited, as mentioned above, when the image acquisition apparatus of the embodiment of the present invention is used for different purposes to acquire images of different purposes, corresponding differences may exist in corresponding structural and parameter settings, for example, when the image acquisition apparatus is used for a front camera, corresponding settings and selections are performed according to a required definition of the front camera to capture an image, where relevant influence factors such as a shooting distance and a shooting definition need to be considered. When the image capturing device is used for fingerprint recognition, it is necessary to perform clear and accurate extraction of information points for fingerprints of fingers attached to the surface of thedisplay screen 10 in a short distance, and when theimage sensor 21 is correspondingly disposed, it is necessary to consider characteristic factors such as the capturing definition of images of nearby objects.

In addition, theimage sensor 21 applied to the electronic device is generally an integral body including an image acquisition pixel array and a package structure, for example, theimage sensor 21 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor, the image acquisition pixel array is a photosensitive pixel array in a two-dimensional plane, each pixel point includes a photodiode structure capable of performing photoelectric conversion, the package structure packages the image acquisition pixel array, the structure closure of the packagedimage sensor 21 is good, so that the stability of acquiring an image is good, the disturbance of factors such as light and vibration in an external environment is not easily caused, and the service life of the packagedimage sensor 21 is also long.

Moreover, in the whole image acquisition device, thecircuit board 20, theimage sensor 21 and theangle sensor 30 are coaxially arranged, and can coaxially rotate under the driving action of thedriving mechanism 40, so that the risk of position change or dislocation of the device under a screen in the process of rotating and adjusting the influence of moire patterns is avoided to the maximum extent.

The image acquisition device provided by the embodiment of the application comprises an image sensor 21 arranged below a display screen 10, wherein the image sensor 21 is used for acquiring an external image through the display screen 10, the image acquisition device further comprises an angle sensor 30 and a driving mechanism 40 which are coaxially arranged with the image sensor 21, the angle sensor 30 and the driving mechanism 40 are all in a coaxial arrangement relationship, under the driving of the driving mechanism, the image sensor 21 and the angle sensor 30 coaxially rotate in a plane parallel to the display screen 10, in the rotating process, through the analysis of the external image acquired through the display screen at each position on a rotating path, an image with the minimum influence of moire on the image in the imaging image at each position on the whole rotating path can be obtained, the image is determined to be a required optimal image, and then the image acquisition device is rotated to a rotating position corresponding to the optimal image through the driving mechanism 40 for positioning, therefore, the image acquisition device can be accurately positioned at the position where the moire fringes have the minimum influence on the image under the screen, the image acquisition device is used as a front-end camera device in the electronic equipment, the influence of the moire fringes is eliminated as far as possible through the adjustment of the rotating position, the imaging effect of the shot image is better, the image acquisition device is used as a fingerprint identification device in the electronic equipment, the influence of the moire fringes is eliminated as far as possible through the adjustment of the rotating position, and the accuracy of fingerprint identification is higher.

Optionally, theangle sensor 30 is a potentiometer, or alternatively, theangle sensor 30 is a gyroscope.

A potentiometer is an adjustable electronic component. It is composed of a resistor body and a rotating or sliding system. When a voltage is applied between two fixed contacts of the resistor body, the position of the contact on the resistor body is changed through a rotating or sliding system, and a voltage which has a certain relation with the position of the moving contact can be obtained between the moving contact and the fixed contacts. The potentiometer is arranged in the image acquisition device as theangle sensor 30, can accurately feed back and record the rotating angle of each position in the process of driving rotation by thedriving mechanism 40, reflects the rotating angle through the change of the voltage value, has high sensitivity, accurate indication value, strong anti-interference capability and stable and reliable work, has compact and small structure, is arranged in the image acquisition device as theangle sensor 30, and is favorable for the miniaturization design of the image acquisition device and the electronic equipment provided with the image acquisition device.

The gyroscope is an angular motion detection device which uses a momentum moment sensitive shell of a high-speed revolving body relative to an inertia space around one or two axes orthogonal to a rotation axis, and can further ensure the accuracy and reliability of angle detection structurally.

Alternatively, thedrive mechanism 40 is a rotary motor.

As shown in fig. 1, thedriving mechanism 40 is a rotating motor, the rotating motor has a small structure and is stable and reliable in operation, and frame-by-frame shooting of theimage sensor 21 can be correspondingly set by controlling or limiting the constant speed and the rotating speed of thedriving mechanism 40, so that, for example, an image can be obtained by theimage sensor 21 every time the image sensor rotates one degree, not less than 360 images can be obtained between 0 ° and 360 °, and through comparison and analysis of the 360 images, the image with the lowest moire degree is found as an optimal image, the corresponding rotating angle value matching the optimal image is obtained by theangle sensor 30, and through rotating thedriving mechanism 40 to the position of the rotating angle value, the optimal obtaining angle of theimage sensor 21 can be achieved, the influence degree of the moire on the image is reduced to the lowest, and the image quality of the image is improved.

Alternatively, the rotary motor may employ a stepping motor. A stepper motor is an electric motor that converts electrical pulse signals into corresponding angular or linear displacements. The rotor rotates an angle or one step before inputting a pulse signal, the output angular displacement or linear displacement is proportional to the input pulse number, and the rotating speed is proportional to the pulse frequency. Therefore, the stepping motor is also called a pulse motor. The stepping motor can more accurately control the rotation angle of each step, and is matched with the image pickup action of theimage sensor 21, so that the angle signal is recorded and the image information is acquired at the rotation pause moment of each step, and the action and the signal recording of the whole device are more stable.

Optionally, fig. 3 is a second schematic structural diagram of an image capturing device provided in the embodiment of the present application, and as shown in fig. 3, a reinforcingsheet 50 is disposed on the back side of thecircuit board 20.

As shown in fig. 3, in general, the overall structure of the image capturing device disposed in the electronic apparatus is small, thecircuit board 20 is also thin, and in order to improve the structural strength of thecircuit board 20, a reinforcingsheet 50 may be disposed on the back side of thecircuit board 20, the reinforcingsheet 50 is generally a thin steel sheet, and the reinforcingsheet 50 and thecircuit board 20 may be attached by welding, so that the structural strength of thecircuit board 20 can be effectively improved without greatly affecting the overall structural size and weight of thecircuit board 20.

Alternatively, theimage sensor 21, theangle sensor 30, and thedriving mechanism 40 are fixed by adhesion.

For example, the whole structure of theimage sensor 21 and thecircuit board 20 after being soldered and packaged can be understood as an image capturing module, and the image capturing module, theangle sensor 30 and thedriving mechanism 40 can be fixedly connected in a pasting manner, for example, 3M glue is adopted to coaxially and tightly adhere the image capturing module, theangle sensor 30 and the driving mechanism. Paste fixed setting of avoiding other fastening connection spare, simple to operate, for welded fastening's non-detachability, when there is structural relation between image acquisition device's the part and needs the adjustment, also can convenient to detach moreover.

Optionally, a heat dissipation structure is further disposed between the drivingmechanism 40 and thecircuit board 20.

When thedriving mechanism 40 is a rotating motor, the motor usually generates heat during initialization or during driving, and when the heat cannot be dissipated well, the rotating motor may generate heat itself, and for an image capturing device with a small overall structure, the heat collected by the rotating motor may affect theimage sensor 21, or even affect the image quality of the image captured by theimage sensor 21. Therefore, a heat dissipation structure is disposed between the drivingmechanism 40 and thecircuit board 20, and heat generated by thedriving mechanism 40 is rapidly conducted and dissipated through the heat dissipation structure, so as to avoid accumulation at the image capturing module.

In the embodiment of the present application, the material, the specific arrangement position, and the heat dissipation manner of the heat dissipation structure are not particularly limited, as long as the heat dissipation structure can conduct heat or contribute to heat dissipation. For example, the heat dissipation structure may be a common heat dissipation manner through structural features, such as a structure provided with or formed with heat dissipation fins, heat conduction grooves, and the like, and for example, a coating of a heat conduction material may be selected to improve the heat dissipation effect, and the heat dissipation structure includes a heat conduction silicone layer. The coating of heat conduction silicone grease layer sets up atactuating mechanism 40 and its position that contacts with the image acquisition module, and good heat conduction effect through heat conduction silicone grease is with heat after deriving the heat fast and diverge, avoids gathering in image acquisition module position department.

Optionally, when the image acquiring apparatus according to the embodiment of the present application is used for a fingerprint identification function under thedisplay screen 10, theimage sensor 21 is a fingerprint image sensor, and is configured to acquire a fingerprint image of a finger above thedisplay screen 10 through thedisplay screen 10.

When the image acquisition device provided with the embodiment of the application is used for the electronic equipment for fingerprint identification, a user only needs to cover a finger on thedisplay screen 10 of the electronic equipment to correspond to the area for fingerprint identification, and the area for fingerprint identification refers to the area where the fingerprint image sensor is correspondingly arranged under thedisplay screen 10. The fingerprint image sensor obtains the fingerprint image of pasting the finger ondisplay screen 10 throughdisplay screen 10 underdisplay screen 10, through analysis and calculation, grabs the fingerprint information in the fingerprint image, because the characteristic information diverse of everyone's finger line, just can confirm or discern user's identity uniquely through fingerprint information.

Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure, and as shown in fig. 4, the electronic device includes adisplay screen 10 and an image capturing device according to any one of the foregoing items, where the image capturing device is disposed below thedisplay screen 10.

Optionally, the image capturing apparatus of the embodiment of the present application further includes acontroller 60, and thecontroller 60 is further electrically connected to theimage sensor 21, theangle sensor 30, and thedriving mechanism 40 in the image capturing apparatus, respectively.

As shown in fig. 4, the following describes a structure and a functional implementation of the image capturing apparatus according to the embodiment of the present application applied to an electronic device. The electronic device comprises adisplay screen 10 and an image acquisition device arranged below thedisplay screen 10, the image acquisition device further comprises acontroller 60, thecontroller 60 is respectively electrically connected with animage sensor 21, anangle sensor 30 and adriving mechanism 40 in the image acquisition device, thedriving mechanism 40 is controlled to be started through thecontroller 60, thedriving mechanism 40 rotates at a constant speed (or rotates at a constant speed in a stepping mode) at a preset speed, theimage sensor 21 acquires a plurality of images at each angle, thecontroller 60 receives image information of theimage sensor 21 and rotation angle information acquired by theangle sensor 30, the rotation angle information and the image information at the same position are matched with each other in thecontroller 60, and analysis and evaluation of the moire degree can be carried out on each image in thecontroller 60. In the embodiment of the present application, a method for analyzing and evaluating a moire degree in an image is not specifically limited, and for example, the method may be a method of comparing an acquired image with a standard image, or a method of directly finding a moire feature on an acquired image, and the like.

It should be noted that, when the image capturing apparatus according to the embodiment of the present application is used in an electronic device, for example, taking a mobile phone as an example, thecontroller 60 in the image capturing apparatus may also adopt acontroller 60 for controlling the implementation of the corresponding function in the mobile phone, thecontroller 60 may be a processor chip of the mobile phone, and thecontroller 60 itself includes a program and a function capable of controlling the implementation of each function in the mobile phone, and then is in signal connection with other elements in the image capturing apparatus to implement the corresponding control function.

In this way, in the process of manufacturing the electronic device according to the embodiment of the present application, the image capturing device may be directly installed in the electronic device, and then the image capturing device according to the embodiment of the present application may be controlled and adjusted by using the existingcontroller 60 in the electronic device, so that the corresponding position of the image capturing device under thedisplay screen 10 is rotationally adjusted to the position where the moire degree of the captured image is the lowest, thereby improving the quality of the image captured by the image capturing device under thedisplay screen 10.

Alternatively, a rotation start position of theimage sensor 21 is preset on the rotation path of thedriving mechanism 40, and thecontroller 60 may control thedriving mechanism 40 to drive theimage sensor 21 to rotate to the rotation start position.

The rotation initial position of the rotation adjustment of the image acquisition device is arranged in the electronic equipment, the rotation initial position is positioned on the rotation path of thedriving mechanism 40, before thecontroller 60 controls thedriving mechanism 40 to rotate, the driving mechanism firstly drives theimage sensor 21 to rotate to the rotation initial position, namely, the image acquisition device returns to the rotation initial position before each rotation adjustment, the rotation initial position is used as a zero starting point of the rotation, and the mode is also convenient for theangle sensor 30 to have reference and calibration of the initial position when recording the angle information of each rotation position in the rotation adjustment process, so that the accuracy of the whole electronic equipment for the adjustment of the image acquisition device is improved.

It should be noted that the rotation initial position set in the electronic device is a determined position point of the image capturing device in the electronic device, and is also an associated point associated with thecontroller 60 and corresponding to the zero position in thecontroller 60, and this position point may in principle be any point on the rotation path of the image capturing device in the electronic device, as long as the position point is associated with the zero position in thecontroller 60, and the rotation adjustment of the image capturing device is started from this position point, and the recording of the rotation angle by theangle sensor 30 is also started from this associated point as the zero starting point. The specific setting can be selected and designed by those skilled in the art according to actual needs. Providing the initial rotation position also facilitates theangular sensor 30 to be determined to be within the range of 0 deg. -360 deg. throughout the adjustment process, e.g., a complete 360 deg. rotation range is indicated when the rotation returns to the initial rotation position. If the rotation adjustment does not reach 360 degrees, the position with the lowest moire degree of the image may not be reached in the whole adjustment process, and the image with the lowest moire degree cannot be found, and if the rotation adjustment exceeds 360 degrees, the acquisition and comparison of the image information are meaningless repeated, so that the system resources and the adjustment time are wasted.

Optionally, a limiting member is further disposed on the rotation path of thedriving mechanism 40, and the limiting member is used for limiting the rotation position of thedriving mechanism 40.

Still take the electronic device as an example of the mobile phone, considering the miniaturization and portability development of the mobile phone, the internal space of the mobile phone is very limited, and on the basis of integrating multiple intelligent functions, the position of the image acquisition device inside the mobile phone is very limited, which may cause that it is difficult to reserve enough space to ensure a 360 ° rotation path after the whole image acquisition device is installed, in this case, the rotation path of the image acquisition device may be set by thecontroller 60 to match the reserved space, or the rotation path of the image acquisition device may be limited by setting a limiting part.

By way of example, at least the rotational path of the adjustment of the positioning position of the image acquisition device can be set between 0 ° and 180 °. Because of the symmetry of the image, the rotation position with a low image moire degree can be usually found within a complete half-turn (180 °), so in the electronic device, a position-limiting element can be disposed at the opposite side of the rotation initial position, that is, a position-limiting element can be disposed at a position from the rotation initial position to 180 ° of the rotation path (since the rotation initial position can be any position on the rotation path in principle, and the position-limiting element only needs to maintain the position relation of the opposite side with the rotation initial position, and a specific position does not need to be defined, the rotation initial position and the position-limiting element are not shown in fig. 4), so that, after the controller 60 controls the driving mechanism 40 to drive the image acquisition module and the angle sensor 30 to rotate 180 °, the whole structure can perform physical position limitation through the position-limiting element, thereby further ensuring that if the control signal of the controller 60 does not send a stop signal in time, the internal structure of the electronic equipment can also limit and stop the rotation, and other structures inside the electronic equipment are prevented from being damaged due to excessive adjustment and rotation under the condition that the internal space is insufficient.

In fig. 4, the structures of the rotation initial position and the limiting member are not shown, and in the embodiment of the present application, the specific setting position of the rotation initial position on the rotation path, and the specific position and the limiting manner of the limiting member are not specifically limited, as long as the above-mentioned corresponding requirements and functions for the rotation initial position and the limiting member can be satisfied.

For example, the limiting member may be configured to limit the driving output end of thedriving mechanism 40, so that the limiting member can be controlled and limited by the driving start end of the image capturing device according to the embodiment of the present application, and the control and limiting operation is more direct and accurate.

Alternatively, as shown in fig. 4, thecontroller 60 and thecircuit board 20, thecontroller 60 and theangle sensor 30, and thecontroller 60 and thedriving mechanism 40 are electrically connected bycoaxial cables 70, respectively.

Coaxial Cable 70(Coaxial Cable) refers to a Cable having two concentric conductors, with the conductors and shield sharing the same axis. The most commoncoaxial cable 70 consists of a copper conductor separated by an insulating material, outside of which is another layer of annular conductor and its insulation, and then the entire cable is of a construction encased by a sheath of polyvinyl chloride or teflon material. Thecoaxial cable 70 is relatively free to extend and retract and rotate, thecoaxial cable 70 is adopted to connect thecontroller 60 with thecircuit board 20, thecontroller 60 with theangle sensor 30 and thecontroller 60 with thedriving mechanism 40, so that thedriving mechanism 40, thecircuit board 20, theangle sensor 30 and theimage sensor 21 are not obstructed by conductive connection when coaxially rotating, and can freely extend and retract, and thecoaxial cable 70 also has the advantages of high transmission speed and small interference, so that the accuracy of the rotation adjustment and positioning of the image acquisition device in the electronic equipment is improved.

In another aspect of the embodiments of the present application, there is provided a method for positioning an image capturing device, and fig. 5 is a flowchart of the method for positioning an image capturing device provided in an embodiment of the present application, and as shown in fig. 5, the method includes:

s101, thedriving mechanism 40 drives theimage sensor 21 and theangle sensor 30 to rotate coaxially;

s102, theimage sensor 21 obtains external image information through thedisplay screen 10 according to a preset frequency, and theangle sensor 30 obtains rotation angle information of thedriving mechanism 40 corresponding to the external image information shooting position according to the same preset frequency;

s103, analyzing the acquired external image information to obtain external image information with the lowest moire degree, determining the external image information with the lowest moire degree as optimal image information, and matching rotation angle information corresponding to the optimal image information as an optimal angle;

and S104, driving theimage sensor 21 and theangle sensor 30 to coaxially rotate to an optimal angle through thedriving mechanism 40.

After the image acquisition device is installed in the electronic device, thedriving mechanism 40 drives theimage sensor 21 and theangle sensor 30 to rotate coaxially (it can be understood that the whole image acquisition device is driven by thedriving mechanism 40 to rotate wholly under the display screen 10), according to the above description, in order to avoid introducing errors in the positioning process, the coaxial rotation should be in a constant speed rotation mode, preferably, a step-by-step constant speed rotation mode can be selected, in the constant speed rotation process, theimage sensor 21 operates according to a preset frequency (for example, frame-by-frame acquisition, and for example, according to the step frequency of the step-by-step constant speed rotation, the pause time of each step), external image information is acquired through thedisplay screen 10, and theangle sensor 30 acquires a corresponding rotation angle according to the same frequency and time point as theimage sensor 21 And the position information is matched and corresponds to the external image information and the rotation angle position information acquired by each frequency point by taking the specific frequency point as a standard. Analyzing and evaluating the acquired external image information, obtaining the external image information with the lowest moire degree in all the received external image information according to a preset analysis and evaluation standard, determining the external image information as the optimal image information, and determining the rotation angle information corresponding to the optimal image information as the optimal angle. After the optimal image information and the corresponding optimal angle are determined, thedriving mechanism 40 drives theimage sensor 21 and theangle sensor 30 to coaxially rotate to the optimal angle, so that the image acquisition module is in the optimal position where the image acquisition module acquires the image and generates the Moire problem with the lowest degree. Because the optimal position is obtained through the system acquisition and comparison verification, when thedriving mechanism 40 drives the image acquisition device to integrally rotate to the optimal position, the image acquisition device can be directly determined and positioned, and the image acquisition device does not need to be disassembled and assembled in the process, so that the rotation angle is more accurately determined, and the adverse effect of external conditions on the accurate positioning of the image acquisition device in the electronic equipment is avoided as much as possible.

Optionally, fig. 6 is a second flowchart of the positioning method of the image obtaining apparatus according to the embodiment of the present application, and as shown in fig. 6, S103, analyzing the obtained multiple pieces of external image information, determining the obtained external image information with the lowest moire degree as the optimal image information, and matching the rotation angle information corresponding to the optimal image information as the optimal angle includes:

s1031, comparing the current external image information with the previous external image information, and reserving the external image information with lower moire degree obtained by comparison;

s1032, acquiring next external image information under a preset frequency, comparing the next external image information with the external image information with lower retained moire degree, and retaining the external image information with lower moire degree obtained through comparison;

and S1033, when the rotation angle information reaches a preset maximum angle value, determining the currently reserved external image information with low moire degree as optimal image information, and matching the rotation angle information corresponding to the optimal image information as an optimal angle.

When analyzing and evaluating the acquired external image information to determine the optimal image information, if the analysis and evaluation is performed after waiting for acquiring all the external image information of each angle position on the whole rotation path, the requirements on storage and calculation resources of thecontroller 60 are high, and the time consumption of the whole positioning process is long due to the analysis and evaluation, so that the processes of rotation adjustment and external image acquisition and analysis and evaluation can be combined.

Firstly, thedriving mechanism 40 drives the whole image acquiring device to rotate, theimage sensor 21 and theangle sensor 30 acquire external image information and current angle position information according to a preset frequency, when the external image information and the angle position information are acquired at the current position, the external image information acquired at the current time is compared with the external image information acquired at the previous time, and one external image information with lower moire degree obtained in the two external image information is reserved, namely, the analysis and evaluation of the acquired external image information are completed once in the adjusting process.

And continuously acquiring next external image information under a preset frequency along with the rotation, comparing the acquired next external image information with the external image information with lower moire degree reserved in the previous analysis and evaluation, reserving the external image information with lower moire degree, and directly discarding the external image information with higher moire degree obtained by comparison. And repeating the analysis and evaluation of every two images, and finishing each analysis and evaluation by using the time of rotation and external image information acquisition.

When the rotation angle information reaches a preset maximum angle value, namely the rotation is completed in a whole rotation path of 360 degrees or 180 degrees, all external image information and the rotation angle information are obtained in the rotation path, corresponding comparison and evaluation are basically completed, one piece of external image information with the lowest Moire pattern program reserved in the whole comparison process is obtained, the external image information with the lower retained Moire pattern degree is determined as the optimal image information, and the rotation angle information corresponding to the optimal image information is matched as the optimal angle. The method can effectively utilize the rotation adjusting time to carry out analysis and comparison, saves system computing resources through pairwise analysis and comparison, and can also save system storage resources if information which does not need to be reserved after comparison is directly discarded.

Alternatively, fig. 7 is a third flowchart of a positioning method of an image capturing apparatus according to an embodiment of the present application, and as shown in fig. 7, a rotation initial position of theimage sensor 21 is preset on a rotation path of thedriving mechanism 40.

S101, before thedriving mechanism 40 drives theimage sensor 21 and theangle sensor 30 to coaxially rotate, the method further comprises the following steps:

s100, thedriving mechanism 40 drives theimage sensor 21 and theangle sensor 30 to coaxially rotate to an initial rotation position, and the rotation angle information of theangle sensor 30 is reset to zero.

When the rotation initial position of theimage sensor 21 is preset on the rotation path of thedriving mechanism 40 in the electronic device, the under-screen positioning method according to the embodiment of the present application is driven to rotate to the rotation initial position by thedriving mechanism 40 before thedriving mechanism 40 drives to rotate, and the rotation angle information of theangle sensor 30 is zeroed at the rotation initial position, so that theangle sensor 30 starts to record the rotation angle information from 0 ° with the rotation initial position as the rotation starting point.

The method for positioning the image acquisition device under the screen can be used for carrying out rotation adjustment to realize positioning and determination of the optimal position under the screen after the image acquisition device is installed in the electronic equipment, and for example, when the electronic equipment provided by the embodiment of the application is used for a long time, fingerprint identification is inaccurate, or the problem of poor image quality occurs in image shooting of a front camera, or when the electronic equipment is subjected to external influences such as collision or impact, the image acquisition device can be subjected to active trigger operation by a user, and the positioning adjustment under the screen is carried out on the image acquisition device again.

In addition, according to the internal structure of the electronic device, the specific use requirements and the setting position of the image capturing device, and other factors, a person skilled in the art can set the preset maximum angle value of the rotation adjustment to 360 ° or 180 ° according to the actual needs in the under-screen positioning method, determine the rotation path according to the preset maximum angle value, and in addition, can also perform corresponding setting in advance for the preset frequencies at which theimage sensor 21 and theangle sensor 30 obtain respective information during the rotation process.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (18)

1. An image acquisition device is characterized by comprising an image sensor, an angle sensor and a driving mechanism, wherein the image sensor is used for being arranged in a fingerprint identification area below a display screen, the angle sensor and the driving mechanism are coaxially arranged with the image sensor, and under the driving of the driving mechanism, the image sensor and the angle sensor coaxially rotate on a plane parallel to the display screen;

the image sensor is a fingerprint image sensor and is used for acquiring a fingerprint image of a finger above the display screen through the display screen.

2. The image capturing apparatus according to claim 1, further comprising a circuit board disposed below the display screen, wherein the image sensor is disposed on the circuit board, and wherein the fingerprint image captured by the image sensor is transmitted to the circuit board.

3. The image capturing device according to claim 1, wherein the angle sensor is a potentiometer or a gyroscope.

4. The image capturing apparatus of claim 1, wherein the drive mechanism is a rotary motor.

5. The image capturing apparatus of claim 4, wherein the rotating motor is a stepper motor.

6. The image capturing apparatus according to any one of claims 2 to 5, wherein a back side of the circuit board is provided with a reinforcing sheet.

7. The image capturing device as claimed in any one of claims 1 to 5, wherein the image sensor, the angle sensor and the driving mechanism are fixed to each other by adhesion.

8. The image capturing device as claimed in any one of claims 2 to 5, wherein a circuit board is further disposed below the display screen, and a heat dissipation structure is further disposed between the driving mechanism and the circuit board.

9. The image capture device of claim 8, wherein the heat dissipation structure comprises a thermally conductive silicone layer.

10. The image capturing apparatus according to any one of claims 1 to 5, further comprising a controller electrically connected to the image sensor, the angle sensor, and the driving mechanism, respectively, and further electrically connected to a circuit board when the image capturing apparatus further comprises the circuit board.

11. The image capturing apparatus as claimed in claim 10, wherein a rotation start position of the image sensor is preset on a rotation path of the driving mechanism, and the controller controls the driving mechanism to drive the image sensor to rotate to the rotation start position.

12. The image capturing device as claimed in claim 11, wherein a limiting member is further disposed on the rotation path of the driving mechanism, and the limiting member is used for limiting the rotation position of the driving mechanism.

13. The image capturing apparatus according to claim 10, wherein the controller and the image sensor, the controller and the angle sensor, and the controller and the driving mechanism are electrically connected by coaxial cables, respectively.

14. An electronic device, comprising a display screen, and an image capturing device as claimed in any one of claims 1 to 13, said image capturing device being arranged below said display screen.

15. A method of positioning an image capture device, the method comprising:

the driving mechanism drives the image sensor and the angle sensor to coaxially rotate;

the method comprises the steps that an image sensor obtains external image information through a display screen according to a preset frequency, and an angle sensor obtains rotation angle information of a driving mechanism corresponding to the shooting position of the external image information according to the same preset frequency;

analyzing the acquired external image information to obtain the external image information with the lowest moire degree, determining the external image information as the optimal image information, and matching the rotation angle information corresponding to the optimal image information as the optimal angle;

and driving the image sensor and the angle sensor to coaxially rotate to the optimal angle through a driving mechanism.

16. The method according to claim 15, wherein the analyzing the acquired plurality of external image information to determine the external image information with the lowest moire degree as the optimal image information, and the matching the rotation angle information corresponding to the optimal image information as the optimal angle comprises:

comparing the current external image information with the previous external image information, and reserving the external image information with lower moire degree obtained by comparison;

acquiring next external image information under a preset frequency, comparing the next external image information with the external image information with lower retained moire degree, and retaining the external image information with lower moire degree obtained through comparison;

when the rotation angle information reaches a preset maximum angle value, determining the external image information with lower Moire pattern degree which is reserved currently as optimal image information, and matching the rotation angle information corresponding to the optimal image information as an optimal angle.

17. The method according to claim 15, wherein a rotation start position of the image sensor is preset on a rotation path of the driving mechanism;

before the driving mechanism drives the image sensor and the angle sensor to coaxially rotate, the method further comprises the following steps:

the driving mechanism drives the image sensor and the angle sensor to coaxially rotate to the initial rotation position, and the rotation angle information of the angle sensor is reset to zero.

18. The method according to claim 16, wherein the preset maximum angle value is 360 ° or 180 °.

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