CN114323593B

CN114323593B - Testing method and testing device of fingerprint detection device

Info

Publication number: CN114323593B
Application number: CN202111675996.2A
Authority: CN
Inventors: 杨小强; 曾玲; 青小刚
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2024-03-15
Anticipated expiration: 2041-12-31
Also published as: CN114323593A

Abstract

The application provides a fingerprint detection device's test method and testing arrangement, improved fingerprint detection device's test efficiency. The fingerprint detection area of the fingerprint detection device is positioned in a display screen, and the test method comprises the following steps: determining that a first test head is positioned in a fingerprint detection area, wherein the first test head is a planar test head; controlling a display screen to present a first light spot in a fingerprint detection area, and acquiring first test data acquired by a fingerprint detection device when the first light spot irradiates a first test head, wherein the first light spot is a light spot with single brightness, and the first test data is used for generating fingerprint background data; and controlling the display screen to present a second light spot in the fingerprint detection area, and acquiring second test data acquired by the fingerprint detection device when the second light spot irradiates the first test head, wherein the second light spot comprises different brightness areas, and the second test data is used for testing the imaging distance of the fingerprint detection device and the response difference of the fingerprint detection device to the different brightness areas.

Description

Testing method and testing device of fingerprint detection device

Technical Field

The embodiment of the application relates to the field of fingerprint detection, and more particularly relates to a testing method and a testing device of a fingerprint detection device.

Background

In the test flow of the fingerprint detection device, three test heads, i.e., a flesh color plane test head, a black color plane test head, and a 3D test head (3D Rubber), are generally required to be tested. The three test heads sequentially press the fingerprint detection area of the fingerprint detection device and cooperate with the change of the light spot brightness or the exposure time on the display screen to obtain the test data of the three test heads. The test data of the plane test head is used for acquiring fingerprint background data, and the fingerprint background data can be applied to a subsequent fingerprint algorithm to extract fingerprint information from data acquired by the fingerprint detection device; the test data of the 3D stripe test head is used for testing whether the fingerprint detection device is qualified in assembly. Because three test heads need to be tested under different spot brightness or exposure time, the current test flow takes longer time.

Disclosure of Invention

The embodiment of the application provides a testing method and testing device of a fingerprint detection device, which improves the testing efficiency of the fingerprint detection device.

In a first aspect, a method for testing a fingerprint detection device is provided, where the fingerprint detection device is configured to be disposed below a display screen of an electronic device, a fingerprint detection area of the fingerprint detection device is located in the display screen, the fingerprint detection device is configured to detect an optical signal that the display screen irradiates a finger and is returned by the finger, and the optical signal is configured to acquire fingerprint data of the finger;

The test method comprises the following steps:

determining that a first test head is positioned in the fingerprint detection area, wherein the first test head is a planar test head;

controlling the display screen to present a first light spot in the fingerprint detection area, and acquiring first test data acquired by the fingerprint detection device when the first light spot irradiates the first test head, wherein the first light spot is a light spot with single brightness, and the first test data is used for generating fingerprint background data;

and controlling the display screen to present a second light spot in the fingerprint detection area, and acquiring second test data acquired by the fingerprint detection device when the second light spot irradiates the first test head, wherein the second light spot comprises different brightness areas, and the second test data is used for testing the imaging distance of the fingerprint detection device and the response difference of the fingerprint detection device to the different brightness areas.

Based on the technical scheme, two groups of test data corresponding to two different types of test heads can be obtained simultaneously by testing the first test head, wherein the first test head is a plane test head, when a display screen presents a first light spot in a fingerprint detection area and irradiates the first test head, a fingerprint detection device collects the first test data, and the first test data can be used for generating fingerprint background data because the first light spot is a light spot with single brightness; when the display screen presents a second light spot in the fingerprint detection area and irradiates the first test head, the fingerprint detection device collects second test data, and the second test data can be used for testing imaging distance of the fingerprint detection device and response difference of the fingerprint detection device to different brightness areas in the second light spot because the second light spot comprises different brightness areas. Therefore, the 3D test head is simulated by controlling the display screen to display light spots with different brightness areas and irradiate the plane test head, so that the application of the 3D test head in the test process can be omitted, the time consumption caused by the frequent replacement of the test head and other operations is avoided, and the test efficiency of the fingerprint detection device is improved.

In one possible implementation, the test method further includes: determining that a second test head is positioned in the fingerprint detection area, wherein the second test head is a planar test head, the color of the second test head is one of black and flesh, and the color of the first test head is the other of black and flesh; and controlling the display screen to present the first light spot in the fingerprint detection area, and acquiring third test data acquired by the fingerprint detection device when the first light spot irradiates the second test head, wherein the third test data and the first test data are used together to generate fingerprint background data.

In this embodiment, a dual test head, i.e., a first test head and a second test head, are used to test the fingerprint detection device, and the first test head and the second test head are plane test heads with different colors, so that the fingerprint detection device is tested without using a 3D test head, the test efficiency is obviously improved, and the test result is not affected.

In one possible implementation, the test method further includes: and controlling the display screen to present the second light spot in the fingerprint detection area, and acquiring fourth test data acquired by the fingerprint detection device when the second light spot irradiates the second test head, wherein the fourth test data and the second test data are used for testing the imaging distance of the fingerprint detection device and the response of the fingerprint detection device to the areas with different brightness.

In this embodiment, the stripe light spot can be controlled to irradiate the first test head and the second test head respectively, so as to obtain more test data, so as to more accurately simulate the test effect of the 3D test head under the irradiation of the light spot with single brightness.

In one possible implementation, the test method further includes: and performing data processing on the first test data to convert the first test data into third test data corresponding to a second test head, wherein the second test head is a planar test head, the second test head is one of black and flesh color, the first test head is the other of black and flesh color, and the third test data and the first test data are jointly used for generating fingerprint background data.

In this embodiment, by performing data processing on the first test data obtained when the first test head is irradiated with the first light spot, third test data corresponding to the second test head can be obtained. Therefore, the second test head can be omitted, and the test of the fingerprint detection device can be completed only by using the first test head, so that the test efficiency is further improved.

In one possible implementation manner, the performing data processing on the first test data includes: and carrying out data processing on the first test data according to a coefficient matrix, wherein the coefficient matrix is the ratio between the test data acquired by the fingerprint detection device when the first light spot irradiates the second test head and the test data acquired by the fingerprint detection device when the first light spot irradiates the first test head.

In this embodiment, the first test data obtained when the first light spot irradiates the first test head is processed by using the coefficient matrix to obtain third test data corresponding to the second test head. The coefficient matrix is calculated in advance before the test starts, and is the ratio between the test data acquired when the first light spot irradiates the second test head and the test data acquired when the first light spot irradiates the first test head. Therefore, the second test head can be omitted, and the test of the fingerprint detection device can be completed only by using the first test head, so that the test efficiency is further improved.

In one possible implementation, the first test data includes: the first light spot irradiates the test data collected by the fingerprint detection device when the first test head is irradiated by the first light spot under the first brightness and/or the first exposure time; and the first light spot irradiates the test data acquired by the fingerprint detection device when the first test head is irradiated under the second brightness and/or the second exposure time, wherein the first brightness is larger than the second brightness, and the first exposure time is larger than the second exposure time.

In one possible implementation, the test method further includes: and when the first light spot irradiates the first test head, calibrating the first exposure time according to test data acquired by the fingerprint detection device, wherein the first exposure time is the exposure time adopted when the fingerprint detection device performs fingerprint detection on the finger.

In one possible implementation, the test method further includes: when the first test head is located in the fingerprint detection area, the display screen is controlled to stop emitting light, and fifth test data collected by the fingerprint detection device are obtained, wherein the fifth test data are associated with circuit noise in the fingerprint detection device.

In one possible implementation, the second light spot is a stripe with alternating brightness and darkness.

In a second aspect, a testing device is provided for testing a fingerprint detection device, where the fingerprint detection device is configured to be disposed below a display screen of an electronic device, a fingerprint detection area of the fingerprint detection device is located in the display screen, and the fingerprint detection device is configured to detect an optical signal that irradiates a finger and is returned by the finger by the display screen, and the optical signal is configured to acquire fingerprint data of the finger.

The test device comprises:

the determining unit is used for determining that a first testing head is positioned in the fingerprint detection area, and the first testing head is a plane testing head;

the detection unit is used for controlling the display screen to present a first light spot in the fingerprint detection area, and acquiring first test data acquired by the fingerprint detection device when the first light spot irradiates the first test head, wherein the first light spot is a light spot with single brightness, and the first test data is used for generating fingerprint background data;

The detection unit is further used for controlling the display screen to present a second light spot in the fingerprint detection area, and acquiring second test data acquired by the fingerprint detection device when the second light spot irradiates the first test head, wherein the second light spot comprises different brightness areas, and the second test data is used for testing the imaging distance of the fingerprint detection device and the response difference of the fingerprint detection device to the different brightness areas.

In a possible implementation manner, the determining unit is further configured to determine that a second test head is located in the fingerprint detection area, where the second test head is a planar test head, a color of the second test head is one of black and flesh, and a color of the first test head is the other of black and flesh; the detection unit is further used for controlling the display screen to present the first light spot in the fingerprint detection area, and acquiring third test data acquired by the fingerprint detection device when the first light spot irradiates the second test head, wherein the third test data and the first test data are jointly used for generating fingerprint background data.

In a possible implementation manner, the detection unit is further configured to control the display screen to present the second light spot in the fingerprint detection area, and obtain fourth test data collected by the fingerprint detection device when the second light spot irradiates the second test head, where the fourth test data and the second test data are used together to test an imaging distance of the fingerprint detection device and a response of the fingerprint detection device to the different brightness areas.

In one possible implementation, the test apparatus further includes: the processing unit is used for carrying out data processing on the first test data so as to convert the first test data into third test data corresponding to a second test head, wherein the second test head is a plane test head, the color of the second test head is one of black and flesh color, the color of the first test head is the other of black and flesh color, and the third test data and the first test data are used for generating fingerprint background data together.

In a possible implementation manner, the processing unit is specifically configured to perform the data processing on the first test data according to a coefficient matrix, where the coefficient matrix is a ratio between the test data collected by the fingerprint detection device when the first light spot irradiates the second test head and the test data collected by the fingerprint detection device when the first light spot irradiates the first test head.

In one possible implementation, the test apparatus further includes: and the calibration unit is used for calibrating the first exposure time according to the test data acquired by the fingerprint detection device when the first light spot irradiates the first test head, wherein the first exposure time is the exposure time adopted when the fingerprint detection device performs fingerprint detection on the finger.

In a possible implementation manner, the detection unit is further configured to control the display screen to stop emitting light when the first test head is located in the fingerprint detection area, and acquire fifth test data collected by the fingerprint detection device, where the fifth test data is associated with circuit noise in the fingerprint detection device.

In a third aspect, a testing device is provided for testing a fingerprint detection device, the testing device comprising a processor and a memory for storing a computer program, the processor being adapted to invoke and run the computer program stored in the memory for performing the testing method as described in the first aspect or any possible implementation of the first aspect.

Drawings

Fig. 1 is a schematic diagram of a test flow of a conventional fingerprint detection device.

Fig. 2 is a schematic flow chart of a test method of the fingerprint detection device according to an embodiment of the present application.

Fig. 3 is a schematic flow chart of one possible implementation of the test method based on fig. 2.

Fig. 4 is a schematic diagram of a test flow based on the test method shown in fig. 3.

Fig. 5 is a schematic diagram of a test flow based on the test method shown in fig. 3.

Fig. 6 is a schematic diagram of a test flow based on the test method shown in fig. 3.

Fig. 7 is a schematic flow chart diagram of another possible implementation of the test method based on fig. 2.

Fig. 8 is a schematic diagram of a test flow based on the test method shown in fig. 7.

Fig. 9 is a schematic diagram of a test flow based on the test method shown in fig. 7.

Fig. 10 is a schematic block diagram of a testing device of the fingerprint detection device according to one embodiment of the present application.

Fig. 11 is a schematic block diagram of a testing device of a fingerprint detection device according to another embodiment of the present application.

Detailed Description

The technical solutions in the present application will be described below with reference to the accompanying drawings.

In the test flow of the fingerprint detection device, three test heads, i.e., a flesh color plane test head, a black color plane test head, and a 3D test head (3D Rubber), are generally required to be tested. As shown in fig. 1, the display screen presents a circular spot. Firstly, testing a flesh color plane test head, wherein the testing comprises the steps of calibrating exposure time, collecting test data of the flesh color plane test head under high brightness or high exposure time and collecting test data of the flesh color plane test head under low brightness or low exposure time; secondly, testing the black plane test head, wherein the testing data of the black plane test head is collected under high brightness or high exposure time, the testing data of the black plane test head is collected under low brightness or low exposure time, and the testing data of the black plane test head is collected during screen failure; finally, the 3D test head is tested, including collecting test data of the 3D test head at high brightness or high exposure time.

Since the test surfaces of the flesh color-planar test head and the black color-planar test head are planar, the test data of the flesh color-planar test head and the black color-planar test head can be used to generate fingerprint background data. The display screen irradiates the flesh color plane test head, and the returned light signal comprises reflected light and transmitted light of the flesh color plane test head. The obtained fingerprint background data can be applied to a fingerprint algorithm, and when the fingerprint detection device is qualified in test and used for fingerprint detection, unnecessary background information in data collected by the fingerprint detection device can be filtered through the fingerprint algorithm, so that useful data related to the fingerprint information is extracted to complete fingerprint detection.

In addition, the planar test head can be used for calibrating the exposure time of the fingerprint detection device so that the signal quantity received by the fingerprint detection device is in a desired range, and when the fingerprint detection device is qualified in test and used for fingerprint detection, the display screen can irradiate fingers in a fingerprint detection area according to the exposure time.

The test data collected during screen-off comprises circuit noise in the fingerprint detection device, and the circuit noise is used for improving the signal-to-noise ratio of the fingerprint detection device.

The 3D test head simulates the 3D form of the fingerprint, has alternate concave-convex stripes on the surface, is flesh-colored, and can be used for testing whether the assembly of the fingerprint detection device is qualified. Specifically, when the fingerprint detection device is tested, a proportional relationship exists between the fringe spacing in the image of the 3D test head collected by the fingerprint detection device and the actual fringe spacing on the 3D test head. Based on the ratio between the imaging fringe spacing and the actual fringe spacing, the magnification of the fingerprint detection device may be determined, and when the magnification is not within a desired range, the imaging lens in the fingerprint detection device may not be mounted in a proper position, and calibration of its mounting position is required. In addition, because the imaging effect of the fingerprint detection device on the concave-convex stripes in the 3D test head is different, the whole machine assembly performance of the fingerprint detection device can be evaluated by utilizing the gray information of the concave-convex stripes in the image of the 3D test head acquired by the fingerprint detection device.

As can be seen from fig. 1, the test head needs to be replaced frequently in the whole test process, and the test production line consumes a long time.

In order to improve the test efficiency, the application provides a test method of a fingerprint detection device, and substitution among different types of test heads is realized by changing light spots of a display screen or adding a proper algorithm, so that the frequency of replacing the test heads in the test process is reduced, and the test efficiency is improved.

Fig. 2 shows a test method of the fingerprint detection device according to an embodiment of the present application. The fingerprint detection device is used for being arranged below a display screen of the electronic equipment, a fingerprint detection area of the fingerprint detection device is located in the display screen, the fingerprint detection device is used for detecting an optical signal of the display screen irradiating a finger and returning by the finger, and the optical signal is used for acquiring fingerprint data of the finger. As shown in fig. 2, the test method 200 includes some or all of the following steps.

In step 210, it is determined that a first test head is located within the fingerprint detection area.

Wherein the first test head is a planar test head. The first test head may be, for example, flesh or black in color, i.e., the first test head is a flesh or black planar test head.

In step 220, the display screen is controlled to present a first light spot in the fingerprint detection area, and when the first light spot irradiates the first test head, first test data acquired by the fingerprint detection device are acquired.

The first light spot is a light spot with single brightness, and the first test data is used for generating fingerprint background data. The fingerprint background data can be applied to a fingerprint algorithm, and when the fingerprint detection device is qualified in test and used for fingerprint detection, unnecessary background information in data collected by the fingerprint detection device can be filtered through the fingerprint algorithm, so that useful data related to the fingerprint information is extracted to complete fingerprint detection.

In step 230, the display screen is controlled to present a second light spot in the fingerprint detection area, and when the second light spot irradiates the first test head, second test data acquired by the fingerprint detection device are acquired.

The second light spot includes areas of different brightness, for example, the second light spot may be stripes with alternating brightness and darkness.

The second test data can be used for testing the imaging distance of the fingerprint detection device, namely the object distance of an imaging lens in the fingerprint detection device, wherein the imaging lens is used for transmitting an optical signal which is used for irradiating a finger by a display screen and returned by the finger to a fingerprint sensor in the fingerprint detection device so as to image the fingerprint of the finger; the second test data is also used for testing the response difference of the fingerprint detection device to different brightness areas in the second light spot. Based on the second test data, the fitting performance of the fingerprint detection device may be evaluated so as to calibrate the fingerprint detection device when it fails.

In this embodiment, by testing the first test head, two sets of test data corresponding to two different types of test heads may be obtained simultaneously, where the first test head is a planar test head, and when the display screen presents a first light spot in the fingerprint detection area and irradiates the first test head, the fingerprint detection device collects the first test data, and since the first light spot is a light spot with a single brightness, the first test data may be used to generate fingerprint background data. When the display screen presents a second light spot in the fingerprint detection area and irradiates the first test head, the fingerprint detection device collects second test data, and the second test data can be used for testing imaging distance of the fingerprint detection device and response difference of the fingerprint detection device to different brightness areas in the second light spot because the second light spot comprises different brightness areas.

Specifically, in step 220, the display screen is controlled to present a first light spot with a single brightness and irradiate the first test head to obtain first test data, where the first test data may be, for example, test data corresponding to the flesh color plane test head or test data corresponding to the black color plane test head in fig. 1.

In step 230, the second test data, such as the test data corresponding to the 3D test head in fig. 1, may be obtained by controlling the display to display the second light spot with the different brightness area and illuminating the first test head without replacing the first test head with the 3D test head.

The refractive index of the convex portion and the concave portion of the 3D test head surface are different, when the 3D test head presses the fingerprint detection area, the refractive index of the convex portion is the refractive index of the material of the 3D test head itself, and the refractive index of the concave portion is the refractive index of the air gap, so that the amounts of the optical signals corresponding to the convex portion and the concave portion are different in the optical signals returned by the 3D test head when the first light spot of single brightness irradiates the 3D test head. Similarly, for the second spot, since it has areas of different brightness, the amount of optical signal returned by the portion of the planar test head corresponding to the area of different brightness is also different when the second spot irradiates the planar test head. Therefore, the second light spots with different brightness areas are used for irradiating the plane test head, so that the test effect can be achieved when the first light spots with single brightness are used for irradiating the 3D test head. Typically, the 3D test head is a stripe with alternating asperities, and in order to simulate the test effect of the 3D test head, the second light spot may be a stripe with alternating brightness and darkness.

Therefore, the second light spots with different brightness areas are displayed through the control display screen and the plane test head is irradiated, so that the test effect of the 3D test head under the irradiation of the light spots with single brightness is simulated, the application of the 3D test head in the test process can be omitted, the time consumption caused by the frequent replacement of the test head and other operations is avoided, and the test efficiency of the fingerprint detection device is improved.

The first test data may include, for example: the first light spot irradiates the test data acquired by the fingerprint detection device when the first test head is irradiated by the first light spot under the first brightness and/or the first exposure time; and the first light spot irradiates the test data acquired by the fingerprint detection device when the first test head is irradiated under the second brightness and/or the second exposure time. Wherein the first brightness is greater than the second brightness, and the first exposure time is greater than the second exposure time. With the first test data collected at high brightness or high exposure time and low brightness or low exposure time, fingerprint background data can be generated for use in subsequent fingerprint detection, thereby filtering out unnecessary background information in the data collected by the fingerprint detection device.

In one implementation, the test method 200 further includes: when the first light spot irradiates the first test head, the exposure time of the fingerprint detection device is calibrated according to test data collected by the fingerprint detection device.

The exposure time is, for example, the first exposure time described above, that is, the exposure time used when the fingerprint detection device performs fingerprint detection on a finger.

In calibrating the exposure time of the fingerprint detection device, the first test head may be illuminated with a different exposure time until the amount of signal received by the fingerprint detection device is within a desired range. When the fingerprint detection device is used for fingerprint detection after being qualified in test, the display screen can irradiate fingers in the fingerprint detection area according to the exposure time.

In one implementation, the test method 200 further includes: when the first test head is located in the fingerprint detection area, the display screen is controlled to stop emitting light, fifth test data acquired by the fingerprint detection device are acquired, and the fifth test data are associated with circuit noise in the fingerprint detection device. Therefore, the fifth test data can be applied in the fingerprint algorithm of fingerprint detection to improve the signal-to-noise ratio of the fingerprint detection device.

In one implementation, as shown in FIG. 3, the test method 200 may further include step 240 and step 250. The steps 240 and 250 may be performed before the steps 210 to 230, or may be performed after the steps 210 to 230, which is not limited.

In step 240, it is determined that the second test head is located within the fingerprint detection area.

Wherein the second test head is a planar test head. The first test head is one of black and flesh color, and the second test head is the other of black and flesh color. Namely, the first test head is a black plane test head, and the second test head is a flesh color plane test head; alternatively, the first test head is a flesh color plane test head and the second test head is a black color plane test head.

In step 250, the display screen is controlled to present a first light spot in the fingerprint detection area, and when the first light spot irradiates the second test head, third test data acquired by the fingerprint detection device are acquired. The third test data and the first test data are used together to generate fingerprint background data, and the third test data may be, for example, test data corresponding to a flesh color plane test head or test data corresponding to a black color plane test head in fig. 1.

In this embodiment, the fingerprint detection device is tested using two test heads, namely a first test head and a second test head, the first test head and the second test head being different-color planar test heads. Specifically, in step 220, a first light spot is displayed on a display screen and a first test head is irradiated, so that first test data corresponding to the first test head is obtained; in step 230, the display screen is controlled to present a second light spot to irradiate the first test head, so as to obtain second test data corresponding to the 3D test head; in step 250, third test data corresponding to the second test head may be obtained by controlling the display to present the first light spot and illuminating the second test head.

For example, as shown in the test flow of fig. 4, steps 240 and 250 may be performed before steps 210 to 230 described above, and the fingerprint detection device is tested using a dual test head. In fig. 4, a black plane test head is taken as a first test head, and a flesh plane test head is taken as a second test head. The display screen may sequentially present a first light spot of a single brightness, such as a circular light spot, and a second light spot having a different brightness region, such as a striped light spot with alternating brightness and darkness.

Firstly, the display screen is controlled to present a circular light spot, and the second test head is mechanically pressed in the fingerprint detection area to test the second test head, wherein the second test head comprises the steps of calibrating exposure time and collecting third test data under high brightness or exposure time and low brightness or exposure time respectively.

And secondly, replacing the test head, replacing the second test head with the first test head, and mechanically pressing the first test head in the fingerprint detection area to test the first test head, wherein the first test head is used for collecting first test data at high brightness or high exposure time and at low brightness or low exposure time respectively, and the fifth test data is collected at the time of screen failure. And then, controlling the display screen to present stripe light spots with alternate brightness and darkness, and still testing the first test head, wherein the second test data is collected under high brightness or high exposure time.

And finally, testing the fingerprint detection device based on the test data, and acquiring related data for fingerprint detection. For example, fingerprint background data is generated based on the first test data and the third test data. For another example, based on the second test data, the imaging distance of the fingerprint detection device and the difference in response of the fingerprint detection device to the bright and dark fringes in the second light spot are tested to evaluate the fitting performance of the fingerprint detection device, so that the fingerprint detection device is calibrated when the fitting performance is not qualified.

As can be seen from fig. 4, the test of the fingerprint detection device is completed only by adopting the flesh color plane test head and the black color plane test head without adopting the 3D test head, so that the test efficiency is obviously improved, and the test result is not affected.

For another example, as shown in the test flow of fig. 5, steps 240 and 250 may be performed after steps 210 to 230 described above, and the fingerprint detection device is tested using a dual test head. In fig. 5, the first test head is a black plane test head and the second test head is a flesh color plane test head.

Firstly, a display screen is controlled to present a circular first light spot, and a first test head is mechanically pressed in a fingerprint detection area to test the first test head, wherein the first test head comprises calibration exposure time and first test data acquisition under high brightness or exposure time and low brightness or exposure time respectively. And then, controlling the display screen to display a second light spot with alternate brightness and darkness, and testing the first test head, wherein the second test data is collected under the condition of high brightness or high exposure time.

And secondly, replacing the test head, replacing the first test head with a second test head, mechanically pressing the second test head in the fingerprint detection area, and controlling the display screen to present a circular first light spot so as to test the second test head, wherein the method comprises the steps of collecting third test data at high brightness or high exposure time and at low brightness or low exposure time respectively and collecting fifth test data at the time of screen failure.

It can also be seen from fig. 5 that the test of the fingerprint detection device is completed only by adopting the flesh color plane test head and the black color plane test head without adopting the 3D test head, so that the test efficiency is obviously improved, and the test result is not affected.

In fig. 4 and fig. 5, the test effect of the 3D test head under the irradiation of the light spot with single brightness is simulated by controlling the display screen to present the stripe light spot with alternate brightness to irradiate the black plane test head. In actual test, the test effect of the 3D test head under the single-brightness light spot irradiation can be simulated by controlling the display screen to display the bright and dark alternate stripe light spots to irradiate the flesh color plane test head, namely, the positions of the first test head and the second test head in fig. 4 and 5 are exchanged, and the test of the fingerprint detection device can be realized.

Of course, in order to acquire more test data, to more accurately simulate the test effect of the 3D test head under the irradiation of the light spot with single brightness, the second light spot can also be controlled to irradiate the black plane test head and the flesh color plane test head respectively.

In one implementation, further, the test method 200 further includes: and controlling the display screen to present a second light spot in the fingerprint detection area, and acquiring fourth test data acquired by the fingerprint detection device when the second light spot irradiates the second test head. The fourth test data and the second test data are used for testing the imaging distance of the fingerprint detection device and the response of the fingerprint detection device to different brightness areas.

For example, as shown in fig. 6, taking the first test head as a black plane test head and the second test head as a flesh color plane test head as an example, the fingerprint detection device respectively collects the first test data and the second test data when the first light spot and the second light spot irradiate the first test head; under the condition that the first light spot and the second light spot irradiate the second test head, the fingerprint detection device respectively acquires third test data and fourth test data. The third test data and the first test data are used together to generate fingerprint background data, and the fourth test data and the second test data are used together to test the imaging distance of the fingerprint detection device and the response of the fingerprint detection device to different brightness areas.

In another implementation, as shown in FIG. 7, the test method 200 may further include a step 260.

In step 260, data processing is performed on the first test data to convert the first test data into third test data corresponding to the second test head.

Wherein the second test head is a planar test head. The first test head is one of black and flesh color, and the second test head is the other of black and flesh color. The third test data and the first test data are used together to generate fingerprint background data.

In one implementation, in step 260, the data processing of the first test data includes: and carrying out data processing on the first test data according to the coefficient matrix.

The coefficient matrix is the proportion between the test data acquired by the fingerprint detection device when the first light spot irradiates the second test head and the test data acquired by the fingerprint detection device when the first light spot irradiates the first test head.

The coefficient matrix may be calculated in advance before the test starts. In the test process, the coefficient matrix is utilized to process data of first test data obtained when the first light spot irradiates the first test head, and third test data corresponding to the second test head can be obtained. In this way, in the actual test process, the second test head is omitted, and only the first test head is used for obtaining the first test data corresponding to the first test head and the third test data corresponding to the second test head.

How to calculate the coefficient matrix is described below.

The test data HF of the first test head and the test data HB of the second test head are collected at a high brightness or high exposure time, or the test data LF of the first test head and the test data LB of the second test head are collected at a low brightness or low exposure time. Next, a coefficient matrix is calculated based on these test data.

The coefficient matrix Ratio may be calculated, for example, by: ratio=hb/HF; alternatively, ratio=lb/LF; alternatively, ratio= (HB/hf+lb/LF)/2.

For example, taking 9 pixels as an example, the test data HF of the first test head at high brightness or high exposure time, the test data LF of the first test head at low brightness or low exposure time, the test data HB of the second test head at high brightness or high exposure time, the test data LB of the second test head at low brightness or low exposure time are as follows:

wherein, the coefficient corresponding to each pixel is: the ratio between the test data of the second test head corresponding to the pixel location and the test data of the first test head corresponding to the pixel location. In this way, when the coefficient matrix Ratio is calculated by three methods of ratio=hb/HF, ratio=lb/LF, or ratio= (HB/hf+lb/LF)/2, respectively, the following calculation results are obtained, respectively:

When the fingerprint detection device is tested, when the first test data HF and LF corresponding to the first test head are collected, the third test data HB and LB corresponding to the second test head may be determined as hb=hf×ratio, and lb=lf×ratio, respectively.

Further, in one implementation manner, in order to make the coefficient matrix Ratio more accurate, multiple times of test data may be adopted, and high-order polynomial fitting is performed on the test data HF of the first test head under high brightness or high exposure time, the test data LF of the first test head under low brightness or low exposure time, the test data HB of the second test head under high brightness or high exposure time, and the test data LB of the second test head under low brightness or low exposure time, so as to obtain corresponding test data HFS, LFS, HBS and LBs, and then the coefficient matrix Ratio is calculated by using the above formula.

For example, as shown in fig. 8, the first test head is a black plane test head, the second test head is a flesh color plane test head, and the test of the fingerprint detection device is implemented using only the first test head. The display screen may sequentially present a first light spot of a single brightness, such as a circular light spot, and a second light spot having a different brightness region, such as a striped light spot with alternating brightness and darkness.

Firstly, a display screen presents a circular light spot, and a first test head is mechanically pressed in a fingerprint detection area to test the first test head, wherein the first test head comprises calibration exposure time, acquisition of first test data corresponding to the first test head under high brightness or high exposure time and low brightness or low exposure time respectively, and acquisition of fifth test data under off-screen. The third test data corresponding to the second test head, i.e., hb=hf×ratio and lb=lf×ratio, can be obtained according to the first test data HF and LF and the coefficient matrix Ratio.

And secondly, controlling the display screen to present stripe light spots with alternate brightness and darkness, and still testing the first test head, wherein the second test data corresponding to the 3D test head is collected under high brightness or high exposure time.

And finally, testing the fingerprint detection device based on the test data, and acquiring related data for fingerprint detection. For example, fingerprint background data is generated based on the first test data and the third test data. For another example, based on the second test data, the imaging distance of the fingerprint detection device and the difference in response of the fingerprint detection device to the bright and dark fringes in the second light spot are determined to evaluate the assembly performance of the fingerprint detection device, so that the fingerprint detection device is calibrated when the assembly performance of the fingerprint detection device is unqualified.

As can be seen from fig. 8, the fingerprint detection device is tested only by using the first test head without using the second test head and the 3D test head having different colors from those of the first test head, so that the test efficiency is significantly improved, and the test result is not affected.

As another example, as shown in fig. 9, a case where the first test head is a black plane test head and the second test head is a flesh color plane test head will be described.

Firstly, the display screen is controlled to present a circular light spot, the first test head is mechanically pressed in the fingerprint detection area, and the first test head is tested to calibrate the exposure time.

Then, the display screen is controlled to present a circular light spot, and the first test head is still tested, including the first test data corresponding to the first test head under the conditions of high brightness or high exposure time and low brightness or low exposure time, and the fifth test data during the screen-off. Wherein, according to the first test data HF and LF and the coefficient matrix Ratio, third test data corresponding to the second test head, namely hb=hf×ratio and lb=lf×ratio, can be obtained.

As can be seen from fig. 9, the fingerprint detection device is tested only by using the first test head without using the second test head and the 3D test head having different colors from those of the first test head, so that the test efficiency is significantly improved, and the test result is not affected.

In fig. 8 and 9, the black plane test head is tested, and first test data corresponding to the black plane test head, second test data corresponding to the 3D test head, and third test data corresponding to the flesh color plane test head are acquired. In actual testing, the flesh color plane test head may be tested, and the first test data corresponding to the flesh color plane test head, the second test data corresponding to the 3D test head, and the third test data corresponding to the black plane test head may be obtained, that is, the first test head in fig. 8 and fig. 9 is replaced with the second test head, which may also implement the test on the fingerprint detection device.

It should be understood that the embodiment of the present application does not limit the actual form of the black plane test head, and the device capable of forming the black plane covering the fingerprint detection area may be used as the black test head. For example, the black planar test head may be a black solid block shown in fig. 1, 4-6 and 8-9, and the black solid block may be disposed in a fingerprint detection area of the display screen, so that a black surface of the test head faces the fingerprint detection device, so that the fingerprint detection device collects test data corresponding to the black test head.

Alternatively, the black plane test head may be a light shielding device such as a small black box, so as to create a darkroom environment, and test the fingerprint detection device in the darkroom environment. For example, in fig. 8 and 9, the first test head may be removed and replaced with a test performed in a darkroom environment, so that a similar test effect can be achieved, where a device such as a small black box for forming the darkroom environment is the first test head. Details of the testing process in the darkroom environment may be referred to the above description of the testing method 200, and for brevity, will not be repeated here.

The above manner of calculating the coefficient matrix Ratio is merely an example, and when the fingerprint detection device is tested after the coefficient matrix Ratio is obtained, the third test data corresponding to the second test head may be calculated by using the first test data corresponding to the first test head, thereby omitting the second test head.

The test method of the fingerprint detection device according to the embodiment of the present application is described above with reference to fig. 2 to 9, and the test device according to the embodiment of the present application is described below with reference to fig. 10 and 11. For specific details of the test device and corresponding advantageous effects reference is made to the description of the test method hereinbefore.

As shown in fig. 10, the test device 300 is configured to test a fingerprint detection device, where the fingerprint detection device is configured to be disposed below a display screen of an electronic device, a fingerprint detection area of the fingerprint detection device is located in the display screen, and the fingerprint detection device is configured to detect an optical signal that irradiates a finger with the display screen and is returned by the finger, and the optical signal is configured to acquire fingerprint data of the finger. The test apparatus 300 includes:

a determining unit 310, configured to determine that a first test head is located in the fingerprint detection area, where the first test head is a planar test head;

the detecting unit 320 is configured to control the display screen to present a first light spot in the fingerprint detection area, and obtain first test data collected by the fingerprint detection device when the first light spot irradiates the first test head, where the first light spot is a light spot with single brightness, and the first test data is used to generate fingerprint background data;

The detection unit 320 is further configured to control the display screen to present a second light spot in the fingerprint detection area, and obtain second test data collected by the fingerprint detection device when the second light spot irradiates the first test head, where the second light spot includes different brightness areas, and the second test data is used to test an imaging distance of the fingerprint detection device and a response difference of the fingerprint detection device to the different brightness areas.

The test apparatus 300 can obtain two sets of test data simultaneously by testing the first test head. The first test head is a plane test head, when the display screen presents a first light spot in the fingerprint detection area and irradiates the first test head, the fingerprint detection device collects first test data, and the first test data can be used for generating fingerprint background data because the first light spot is a light spot with single brightness; when the display screen presents a second light spot in the fingerprint detection area and irradiates the first test head, the fingerprint detection device collects second test data, and the second test data can be used for testing imaging distance of the fingerprint detection device and response difference of the fingerprint detection device to different brightness areas in the second light spot because the second light spot comprises different brightness areas. Therefore, the 3D test head is simulated by controlling the display screen to display light spots with different brightness areas and irradiate the plane test head, so that the application of the 3D test head in the test process can be omitted, the time consumption caused by the frequent replacement of the test head and other operations is avoided, and the test efficiency of the fingerprint detection device is improved.

In one implementation, the determining unit 310 is further configured to determine that a second test head is located in the fingerprint detection area, where the second test head is a planar test head, the second test head has one of black and flesh color, and the first test head has the other of black and flesh color; the detection unit 320 is further configured to control the display screen to present the first light spot in the fingerprint detection area, and obtain third test data collected by the fingerprint detection device when the first light spot irradiates the second test head, where the third test data and the first test data are used together to generate fingerprint background data.

In one implementation manner, the detecting unit 320 is further configured to control the display screen to present the second light spot in the fingerprint detection area, and obtain fourth test data collected by the fingerprint detection device when the second light spot irradiates the second test head, where the fourth test data and the second test data are used together to test an imaging distance of the fingerprint detection device and a response of the fingerprint detection device to the different brightness areas.

In one implementation, the test apparatus 300 further comprises: and a processing unit 330, configured to perform data processing on the first test data, so as to convert the first test data into third test data corresponding to a second test head, where the second test head is a planar test head, the second test head is one of black and flesh, the first test head is the other of black and flesh, and the third test data and the first test data are used together to generate fingerprint background data.

In one implementation manner, the processing unit 330 is specifically configured to perform the data processing on the first test data according to a coefficient matrix, where the coefficient matrix is a ratio between the test data collected by the fingerprint detection device when the first light spot irradiates the second test head and the test data collected by the fingerprint detection device when the first light spot irradiates the first test head.

In one implementation, the first test data includes: the first light spot irradiates the test data collected by the fingerprint detection device when the first test head is irradiated by the first light spot under the first brightness and/or the first exposure time; and the first light spot irradiates the test data acquired by the fingerprint detection device when the first test head is irradiated under the second brightness and/or the second exposure time, wherein the first brightness is larger than the second brightness, and the first exposure time is larger than the second exposure time.

In one implementation, the test apparatus 300 further comprises: and the calibration unit 340 is configured to calibrate the first exposure time according to the test data collected by the fingerprint detection device when the first light spot irradiates the first test head, where the first exposure time is an exposure time used when the fingerprint detection device performs fingerprint detection on the finger.

In one implementation, the detecting unit 320 is further configured to control the display screen to stop emitting light when the first test head is located in the fingerprint detection area, and obtain fifth test data collected by the fingerprint detection device, where the fifth test data is associated with circuit noise in the fingerprint detection device.

In one implementation, the second light spot is a stripe with alternating light and dark.

As shown in fig. 11, the present application further provides a testing device 400 for testing a fingerprint detection device, where the testing device 400 includes a processor 410 and a memory 420, the memory 420 is used for storing a computer program, and the processor 410 is used for calling and running the computer program stored in the memory, so as to execute the testing method in any implementation manner.

The system, apparatus and method disclosed in the embodiments of the present application may be implemented in other manners. For example, some features of the method embodiments described above may be omitted or not performed. The above-described apparatus embodiments are merely illustrative, and the division of units is merely one logical function division, and there may be another division manner in actual implementation, and a plurality of units or components may be combined or may be integrated into another system. In addition, the coupling between the elements or the coupling between the elements may be direct or indirect, including electrical, mechanical, or other forms of connection.

It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working processes and technical effects of the apparatus and device described above may refer to corresponding processes and technical effects in the foregoing method embodiments, which are not described in detail herein.

It should be noted that, on the premise of no conflict, the embodiments described in the present application and/or the technical features in the embodiments may be arbitrarily combined with each other, and the technical solutions obtained after the combination should also fall into the protection scope of the present application.

It should be understood that the specific examples in the embodiments of the present application are only for helping those skilled in the art to better understand the embodiments of the present application, and not limit the scope of the embodiments of the present application, and those skilled in the art may make various improvements and modifications based on the above embodiments, and these improvements or modifications fall within the protection scope of the present application.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for testing a fingerprint detection device, characterized in that the method is used for testing the performance of the fingerprint detection device and acquiring data for fingerprint identification, the fingerprint detection device is used for being arranged below a display screen of an electronic device, a fingerprint detection area of the fingerprint detection device is positioned in the display screen, the fingerprint detection device is used for detecting an optical signal which irradiates a finger and is returned by the finger, the optical signal is used for acquiring fingerprint data of the finger,

The test method comprises the following steps:

controlling the display screen to present a second light spot in the fingerprint detection area, and acquiring second test data acquired by the fingerprint detection device when the second light spot irradiates the first test head, wherein the second light spot comprises different brightness areas, and the second test data is used for testing the imaging distance of the fingerprint detection device and the response difference of the fingerprint detection device to the different brightness areas;

wherein, the test method further comprises:

determining that a second test head is positioned in the fingerprint detection area, wherein the second test head is a planar test head, the color of the second test head is one of black and flesh, and the color of the first test head is the other of black and flesh;

And controlling the display screen to present the first light spot in the fingerprint detection area, and acquiring third test data acquired by the fingerprint detection device when the first light spot irradiates the second test head, wherein the third test data and the first test data are used together to generate fingerprint background data.

2. The test method of claim 1, wherein the test method further comprises:

and controlling the display screen to present the second light spot in the fingerprint detection area, and acquiring fourth test data acquired by the fingerprint detection device when the second light spot irradiates the second test head, wherein the fourth test data and the second test data are used for testing the imaging distance of the fingerprint detection device and the response of the fingerprint detection device to the areas with different brightness.

3. The test method of claim 1, wherein the test method further comprises:

and performing data processing on the first test data to convert the first test data into third test data corresponding to a second test head, wherein the second test head is a planar test head, the second test head is one of black and flesh color, the first test head is the other of black and flesh color, and the third test data and the first test data are jointly used for generating fingerprint background data.

4. A test method according to claim 3, wherein said data processing of said first test data comprises:

and carrying out data processing on the first test data according to a coefficient matrix, wherein the coefficient matrix is the ratio between the test data acquired by the fingerprint detection device when the first light spot irradiates the second test head and the test data acquired by the fingerprint detection device when the first light spot irradiates the first test head.

5. The test method according to any one of claims 1 to 4, wherein the first test data comprises:

the first light spot irradiates the test data collected by the fingerprint detection device when the first test head is irradiated by the first light spot under the first brightness and/or the first exposure time; the method comprises the steps of,

the first light spot irradiates the test data collected by the fingerprint detection device when the first test head is irradiated under the second brightness and/or the second exposure time, wherein the first brightness is larger than the second brightness, and the first exposure time is larger than the second exposure time.

6. The test method of claim 5, further comprising:

And when the first light spot irradiates the first test head, calibrating the first exposure time according to test data acquired by the fingerprint detection device, wherein the first exposure time is the exposure time adopted when the fingerprint detection device performs fingerprint detection on the finger.

7. The test method according to any one of claims 1 to 4, further comprising:

when the first test head is located in the fingerprint detection area, the display screen is controlled to stop emitting light, and fifth test data collected by the fingerprint detection device are obtained, wherein the fifth test data are associated with circuit noise in the fingerprint detection device.

8. The method of any one of claims 1 to 4, wherein the second spot is a stripe of alternating light and dark.

9. A testing device is characterized by being used for testing the performance of a fingerprint detection device and acquiring data for fingerprint identification, wherein the fingerprint detection device is used for being arranged below a display screen of an electronic device, a fingerprint detection area of the fingerprint detection device is positioned in the display screen, the fingerprint detection device is used for detecting an optical signal which irradiates a finger and is returned by the finger through the display screen, the optical signal is used for acquiring fingerprint data of the finger,

The test device comprises:

the detection unit is further used for controlling the display screen to present a second light spot in the fingerprint detection area, and acquiring second test data acquired by the fingerprint detection device when the second light spot irradiates the first test head, wherein the second light spot comprises different brightness areas, and the second test data is used for testing the imaging distance of the fingerprint detection device and the response difference of the fingerprint detection device to the different brightness areas;

the determining unit is further configured to determine that a second test head is located in the fingerprint detection area, where the second test head is a planar test head, the second test head is one of black and flesh, and the first test head is the other of black and flesh;

The detection unit is further used for controlling the display screen to present the first light spot in the fingerprint detection area, and acquiring third test data acquired by the fingerprint detection device when the first light spot irradiates the second test head, wherein the third test data and the first test data are jointly used for generating fingerprint background data.

10. The test device of claim 9, wherein the test device comprises a plurality of test elements,

the detection unit is further used for controlling the display screen to present the second light spot in the fingerprint detection area, and acquiring fourth test data acquired by the fingerprint detection device when the second light spot irradiates the second test head, wherein the fourth test data and the second test data are used for testing the imaging distance of the fingerprint detection device and the response of the fingerprint detection device to the areas with different brightness.

11. The test device of claim 9, wherein the test device further comprises:

the processing unit is used for carrying out data processing on the first test data so as to convert the first test data into third test data corresponding to a second test head, wherein the second test head is a plane test head, the color of the second test head is one of black and flesh color, the color of the first test head is the other of black and flesh color, and the third test data and the first test data are used for generating fingerprint background data together.

12. The test device of claim 11, wherein the test device comprises a plurality of test elements,

the processing unit is specifically configured to perform the data processing on the first test data according to a coefficient matrix, where the coefficient matrix is a ratio between the test data collected by the fingerprint detection device when the first light spot irradiates the second test head and the test data collected by the fingerprint detection device when the first light spot irradiates the first test head.

13. The test device of any one of claims 9 to 12, wherein the first test data comprises:

14. The test device of claim 13, wherein the test device further comprises:

And the calibration unit is used for calibrating the first exposure time according to the test data acquired by the fingerprint detection device when the first light spot irradiates the first test head, wherein the first exposure time is the exposure time adopted when the fingerprint detection device performs fingerprint detection on the finger.

15. The test device according to any one of claims 9 to 12, wherein,

the detection unit is further used for controlling the display screen to stop emitting light when the first test head is located in the fingerprint detection area, and acquiring fifth test data acquired by the fingerprint detection device, wherein the fifth test data is associated with circuit noise in the fingerprint detection device.

16. The test device of any one of claims 9 to 12, wherein the second light spot is a stripe of alternating light and dark.

17. A testing device for testing a fingerprint sensing device, the testing device comprising a processor and a memory, the memory for storing a computer program, the processor for invoking and running the computer program stored in the memory to perform the method of testing a fingerprint sensing device according to any one of claims 1 to 8.