CN110427910B

CN110427910B - Electronic device and control method of electronic device

Info

Publication number: CN110427910B
Application number: CN201910736203.XA
Authority: CN
Inventors: 吴安平; 杨乐
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-08-09
Filing date: 2019-08-09
Publication date: 2022-04-05
Anticipated expiration: 2039-08-09
Also published as: CN110427910A

Abstract

The application provides an electronic device and a control method of the electronic device, wherein the electronic device comprises a display screen, a controller, a light-emitting unit and a photosensitive array integrated in the display screen, the light-emitting unit is used for emitting fingerprint identification light, and the fingerprint identification light is received by the photosensitive array after being reflected by a finger to form a fingerprint signal; the method comprises the following steps: the method comprises the steps that a controller obtains a target difference value between the light intensity of a first position and the light intensity of a second position on a light-transmitting cover plate of a display screen, wherein fingerprint identification light is transmitted to the first position, the first position corresponds to a first photosensitive unit in a photosensitive array, and the second position corresponds to a second photosensitive unit in the photosensitive array; the controller generates a compensation signal according to the target difference value, and transmits the compensation signal to a signal control element corresponding to the second photosensitive unit so as to perform signal compensation on the fingerprint signal acquired by the second photosensitive unit. The electronic equipment and the control method of the electronic equipment can improve fingerprint identification efficiency.

Description

Electronic device and control method of electronic device

Technical Field

The present disclosure relates to the field of electronic technologies, and in particular, to an electronic device and a control method of the electronic device.

Background

The problem of low fingerprint identification efficiency exists in the optical fingerprint identification in the electronic equipment. How to improve the fingerprint identification efficiency becomes a technical problem to be solved.

Content of application

The application provides an electronic device and a control method of the electronic device, so as to improve fingerprint identification efficiency.

In a first aspect, the present application provides a method for controlling an electronic device, where the electronic device includes a display screen, a controller, a light-emitting unit, and a photosensitive array integrated in the display screen, where the light-emitting unit is configured to emit a fingerprint identification light, and the fingerprint identification light is received by the photosensitive array after being reflected by a finger to form a fingerprint signal; the method comprises the following steps:

the controller obtains a target difference value between the light intensity of a first position and the light intensity of a second position on a light-transmitting cover plate of the display screen, wherein the fingerprint identification light is transmitted to the first light-sensing unit in the light-sensing array, and the second position corresponds to a second light-sensing unit in the light-sensing array;

and the controller generates a compensation signal according to the target difference value and transmits the compensation signal to a signal control element corresponding to the second photosensitive unit so as to perform signal compensation on the fingerprint signal acquired by the second photosensitive unit.

In a second aspect, the present application provides an electronic device, including:

the display screen comprises a light-transmitting cover plate, wherein the light-transmitting cover plate comprises a light-transmitting part and a non-light-transmitting part surrounding the light-transmitting part;

the photosensitive array is integrated in the display screen and covered by the light-transmitting part, the photosensitive array is provided with a plurality of photosensitive units which are arranged in an array mode, the plurality of photosensitive units comprise a first photosensitive unit and a second photosensitive unit, the first photosensitive unit corresponds to the first position of the light-transmitting cover plate, and the second photosensitive unit corresponds to the second position of the light-transmitting cover plate;

the light-emitting unit is covered by the non-light-transmitting part and is used for emitting fingerprint identification light rays which are received by the photosensitive array after being reflected by fingers;

the controller is electrically connected with the photosensitive array and used for acquiring a target difference value between the light intensity of the fingerprint identification light transmitted to the first position and the light intensity of the second position, generating a compensation signal according to the target difference value, and transmitting the compensation signal to a signal control element corresponding to the second photosensitive unit so as to perform signal compensation on the fingerprint signal acquired by the second photosensitive unit.

In this application, when carrying out fingerprint identification, the controller acquires the light intensity of the first position on the printing opacity apron of luminescence unit transmission and the target difference between the light intensity of second position, and generate the compensation signal according to the target difference, and send the compensation signal to the sensitization unit that corresponds, this sensitization unit is corresponding to the position that printing opacity apron fingerprint identification light intensity is weak, in order to improve the luminance of the fingerprint picture that this sensitization unit gathered, with the compensation because of the fingerprint identification light of transmission along with transmission distance and the influence of decay to the fingerprint signal that sensitization unit gathered, and then improve fingerprint identification's efficiency, can also improve the resolution accuracy of true and false finger.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Fig. 2 is a front view of an electronic device according to an embodiment of the present application.

FIG. 3 is a cross-sectional view of one of the electronic devices provided in FIG. 2 taken along line A-A.

Fig. 4 is a partial enlarged view of one of the electronic devices provided in fig. 3.

Fig. 5 is another cross-sectional view of one of the electronic devices provided in fig. 2, taken along line a-a.

Fig. 6 is a partial enlarged view of one of the electronic devices provided in fig. 5.

Fig. 7 is a schematic circuit structure diagram of an electronic device according to a second embodiment of the present application.

Fig. 8 is a schematic circuit structure diagram of an electronic device according to a third embodiment of the present application.

Fig. 9 is yet another cross-sectional view of the electronic device provided in fig. 2, taken along line a-a.

Fig. 10 is a partial enlarged view of one of the electronic devices provided in fig. 9.

Fig. 11 is a schematic circuit structure diagram of an electronic device according to a fourth embodiment of the present application.

Fig. 12 is a schematic circuit structure diagram of an electronic device according to a fifth embodiment of the present application.

Fig. 13 is a schematic circuit structure diagram of an electronic device according to a sixth embodiment of the present application.

Fig. 14 is a schematic circuit structure diagram of an electronic device according to a seventh embodiment of the present application.

Fig. 15 is a flowchart of a control method of an electronic device according to a first embodiment of the present application.

Fig. 16 is a flowchart of a method for controlling an electronic device according to a second embodiment of the present application.

Fig. 17 is a flowchart of a control method of an electronic device according to a third embodiment of the present application.

Fig. 18 is a flowchart of a control method for an electronic device according to a fourth embodiment of the present application.

Fig. 19 is a flowchart of a control method for an electronic device according to a fifth embodiment of the present application.

Fig. 20 is a flowchart of a control method for an electronic device according to a sixth embodiment of the present application.

Fig. 21 is a flowchart of a method for controlling an electronic device according to a seventh embodiment of the present application.

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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The embodiments listed in the present application may be appropriately combined with each other.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure. The electronic device 100 may be a phone, a television, a tablet computer, a mobile phone, a camera, a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, a base station, or other devices with a fingerprint recognition function. Taking the electronic device 100 as a mobile phone as an example, for convenience of description, the electronic device 100 is defined with reference to the first viewing angle, the width direction of the electronic device 100 is defined as the X direction, the length direction of the electronic device 100 is defined as the Y direction, and the thickness direction of the electronic device 100 is defined as the Z direction.

Referring to fig. 2 and fig. 3, an electronic device 100 is provided in an embodiment of the present disclosure. The electronic device 100 includes a display 1, a photosensitive array 2, a light emitting unit 3, and a controller 4. The display screen 1 comprises a light-transmissive cover plate 11. The light-transmissive cover plate 11 includes a light-transmissive portion 112 and a non-light-transmissive portion 112 surrounding the light-transmissive portion 111. The light-transmitting portion 111 has a high transmittance to visible light, for example, 85 to 100%. The light-transmitting cover plate 11 may be a glass substrate and light-shielding ink attached or coated on the glass substrate, the non-light-transmitting portion 111 is formed in a region where the light-shielding ink is located, and the light-transmitting portion 111 is formed in a region where the light-shielding ink is not located on the glass substrate. It can be understood that when the display screen 1 is bright, the display screen of the display screen 1 can be displayed through the light-transmitting portion 111; when the display panel 1 is turned off, the light-transmitting portion 111 appears black.

Referring to fig. 2, 3 and 5, the light emitting unit 3 is covered by the non-light-transmitting portion 111. Of course, in other embodiments, the light emitting unit 3 may be covered by the light transmitting portion 111. The photosensitive array 2 is integrated in the display screen 1 and covered by the light-transmitting portion 111. When the display screen 1 is turned off and the finger F presses the light-transmitting portion 111, or the payment application performs a data transfer operation and the finger F presses the light-transmitting portion 111, the light-emitting unit 3 emits fingerprint identification light to the whole light-transmitting portion 111 or a part of the light-transmitting portion 111, and the fingerprint identification light is reflected by the finger F and then received by the photosensitive array 2 arranged below the light-transmitting portion 111, so that the photosensitive array 2 collects fingerprint signals and stores and identifies the fingerprint signals. It is understood that the area of the photosensitive array 2 corresponding to the light-transmitting portion 111 of the light-transmitting cover plate 11 is not limited in the present application. That is, the photosensitive array 2 may correspond to a part of the light-transmitting portion 111 of the light-transmitting cover 11, or may correspond to the entire light-transmitting portion 111 of the light-transmitting cover 11. The photosensitive array 2 corresponds to the entire light-transmissive portion 111 of the light-transmissive cover 11, that is, the user can perform fingerprint recognition on the entire light-transmissive portion 111.

In this application, the photosensitive array 2 is exemplified to correspond to the entire light-transmitting portion 111 of the light-transmitting cover 11.

Referring to fig. 2, the photosensitive array 2 has a plurality of photosensitive units 21 arranged in an array. In other words, the plurality of photosensitive cells 21 are arranged in n rows and M columns. N, M are positive integers, and N and M may be equal or different. Referring to fig. 4 and 6, the plurality of photosensitive units 21 includes a first photosensitive unit 211 and a second photosensitive unit 212. The first photosensitive unit 211 corresponds to the first position 113 of the light-transmissive cover 11. Specifically, the first position 113 of the light-transmitting cover plate 11 may be located right above the first photosensitive unit 211. Wherein the first position 113 corresponds to a local area of the outer surface of the light-transmissive cover plate 11. In the thickness direction (Z-axis direction) of the display screen 1, the orthographic projection area of the first photosensitive unit 211 on the light-transmitting portion 111 may partially overlap with the area where the first position 113 is located. The second photosensitive unit 212 corresponds to the second position 114 of the light-transmissive cover 11. The correspondence between the second photosensitive unit 212 and the second position 114 of the transparent cover 11 can refer to the correspondence between the first photosensitive unit 211 and the first position 113 of the transparent cover 11, and is not described herein again. Here, the first position 113 and the second position 114 are different positions, and the first photosensitive unit 211 and the second photosensitive unit 212 are different photosensitive units 21.

It is understood that the light emitting unit 3 is disposed below the non-light-transmitting portion 111, and the fingerprint identification light emitted from the light emitting unit 3 is lost during transmission. Referring to fig. 4 and 6, when the distance between the first position 113 and the light emitting unit 3 is different from the distance between the second position 114 and the light emitting unit 3, the fingerprint identification light emitted by the light emitting unit 3 is transmitted to the first position 113 and the second position 114 with different intensities. For convenience of description, the intensity of the light transmitted by the fingerprint identification light emitted by the light emitting unit 3 to the first position 113 is defined as a first light intensity, and the intensity of the light transmitted by the fingerprint identification light emitted by the light emitting unit 3 to the second position 114 is defined as a second light intensity.

Referring to fig. 3, the controller 4 is electrically connected to the photosensitive array 2. The controller 4 is configured to obtain a target difference between the first light intensity and the second light intensity, generate a compensation signal according to the target difference, and transmit the compensation signal to the second photosensitive unit 212 or a signal control element corresponding to the second photosensitive unit 212, so as to perform signal compensation on the fingerprint signal acquired by the second photosensitive unit 212.

The embodiment takes the first light intensity as an example to be greater than the second light intensity. It is understood that when the first light intensity and the second light intensity are equal, the target difference is 0, and the controller 4 does not need to generate the compensation signal to compensate the fingerprint signal collected by the second photosensitive unit 212. When the first light intensity is less than the second light intensity, the compensation signal generated by the controller 4 may act on the first light-sensing unit 211 to compensate the fingerprint signal collected by the first light-sensing unit 211.

Referring to fig. 4 and 6, when the distances between the first position 113, the second position 114 and the light emitting unit 3 are different, the intensities of the light transmitted from the light emitting unit 3 to the first position 113 and the second position 114 are different, that is, the first light intensity and the second light intensity are different. Referring to fig. 4, when the finger F performs fingerprint identification near the light-emitting unit 3, the intensity of the fingerprint identification light irradiated onto the finger F is relatively large; referring to fig. 6, when the finger F performs fingerprint identification at a position far away from the light-emitting unit 3, the intensity of the fingerprint identification light irradiated onto the finger F is relatively small. As the distance between the area where the finger F performs fingerprint recognition and the light emitting unit 3 increases, the intensity of the fingerprint recognition light irradiated onto the finger F gradually decreases.

Thus, for the full-screen fingerprint identification, the overall brightness of the fingerprint image collected by the light sensing unit 21 close to the light emitting unit 3 (the overall brightness of the fingerprint image refers to the gray scale value of the dark stripe in the gray scale image of the fingerprint image) may be high, and the overall brightness of the fingerprint image collected by the sensing unit far from the light emitting unit 3 may be low, so that the problems that the fingerprint signal collected by the sensing unit close to the light emitting unit 3 is too exposed, and the fingerprint signal collected by the sensing unit far from the light emitting unit 3 is not clear, and the like may occur, thereby resulting in the low fingerprint identification efficiency. Moreover, when the electronic device 100 determines a true finger or a false finger according to the brightness difference of the fingerprint image, if the light intensity difference of two fingerprint signals collected by different areas (for example, close to the light emitting unit 3 and far from the light emitting unit 3) of the photosensitive array 2 is large, the controller 4 cannot determine whether the two fingerprint signals are caused by the difference between the positions of the two fingers for performing fingerprint identification, or the difference between the positions of the two fingers for performing fingerprint identification. Therefore, the electronic device 100 cannot accurately distinguish between the true finger and the false finger.

When fingerprint identification is carried out, the controller 4 obtains a target difference value between the light intensity of the first position 113 and the light intensity of the second position 114 on the light-transmitting cover plate 11 emitted by the light-emitting unit 3, generates a compensation signal according to the target difference value, and sends the compensation signal to the corresponding photosensitive unit 21, the photosensitive unit 21 corresponds to the position where the light intensity of fingerprint identification of the light-transmitting cover plate 11 is weak, so as to improve the brightness of a fingerprint image collected by the photosensitive unit 21, so as to compensate the influence of attenuation of the emitted fingerprint identification light along with the transmission distance on the fingerprint signal collected by the photosensitive unit 21, further improve the efficiency of fingerprint identification, and also improve the resolution accuracy of the true and false finger F.

Referring to fig. 2, the first position 113 is a position where the intensity of the light received by the transparent cover plate 11 of the display screen 1 is maximum. Ideally, the position on the transparent cover plate 11 of the display screen 1 where the intensity of the received light is maximum is the position closest to the light-emitting unit 3. The light sensing unit as shown in the dashed box in fig. 2 is the first light sensing unit. The first photosensitive unit 211 corresponding to the first position 113 is the photosensitive unit 21 closest to the light emitting unit 3. In the present embodiment, any one of the photosensitive units 21 in the photosensitive array 2 except for the first photosensitive unit 211 in the broken line frame is defined as the second photosensitive unit 212.

The controller 4 is arranged to acquire a target difference value between the fingerprint identification light intensity received by each second photosensitive unit 212 corresponding to the position on the transparent cover plate 11 and the first light intensity, generate a corresponding compensation signal for each target difference value, and send the compensation signal to the corresponding second photosensitive unit 212, so that the fingerprint signal collected by each second photosensitive unit 212 can be enhanced to a corresponding degree, and the influence of the transmitted fingerprint identification light on the fingerprint signal collected by each second photosensitive unit 212 due to attenuation along with the transmission distance is compensated. After the compensation is performed for each second photosensitive unit 212, the intensity of the fingerprint recognition light ray is the same for each position like the light-transmitting portion 111. In this way, no matter whether the finger F performs fingerprint identification at a position close to the light emitting unit 3 or far from the light emitting unit 3, the brightness of the fingerprint image collected by the photosensitive array 2 is the same (the brightness of the fingerprint image herein refers to the brightness of the whole fingerprint image, for example, the gray scale values of all dark lines in the gray scale image of the fingerprint image, but does not refer to the brightness of the light and dark lines in the fingerprint image being the same), so that the fingerprint identification efficiency is improved, and the resolution of the electronic device 100 for the true and false fingers F is also improved.

The larger the distance of the second photosensitive unit 212 from the light emitting unit 3, the larger the target difference between the intensity of the fingerprint recognition light received by the second photosensitive unit 212 at the position corresponding to the light transmitting portion 111 and the first light intensity. The compensation signal generated by the controller 4 increases with an increase in the target difference to compensate for the effect of the attenuation of the emitted fingerprint identification light with the transmission distance on the fingerprint signal collected by the second photosensitive unit 212. In other words, the compensation signal is used to compensate the fingerprint signal collected by the second photosensitive unit 212. Generally, the closer the second photosensitive unit 212 is to the light emitting unit 3, the less compensation effect of the compensation signal on the fingerprint signal collected by the photosensitive unit 21 is; the farther the second photosensitive unit 212 is from the light emitting unit 3, the greater the compensation effect of the compensation signal on the fingerprint signal collected by the photosensitive unit 21.

Of course, in other embodiments, the intensity of the fingerprint identification light received by the first light sensing unit 211 corresponding to the position of the light-transmissive cover 11 is not the maximum. Then, when the intensity of the fingerprint identification light received by the second photosensitive unit 212 corresponding to the position of the transparent cover 11 is greater than the first light intensity, the compensation signal generated by the controller 4 will reduce the intensity of the fingerprint signal collected by the second photosensitive unit 212.

Specifically, the controller 4 establishes a light transmission model with the light-emitting unit 3 as a center, and obtains a mapping relationship between the light intensity and the distance of the fingerprint identification light emitted by the light-emitting unit 3 in the light-transmitting cover plate 11, so as to calculate the intensity of the fingerprint identification light received at any coordinate position on the light-transmitting cover plate 11. The controller 4 obtains the intensities of the fingerprint recognition light received by the first photosensitive unit 211 and the second photosensitive unit 212 corresponding to the positions on the transparent cover plate 11, respectively, and then obtains the difference value to generate the compensation signal according to the difference value.

The following embodiment will specifically describe that the controller 4 generates a compensation signal according to the target difference, and transmits the compensation signal to the second photosensitive unit 212 or a signal control element corresponding to the second photosensitive unit 212.

In a first possible embodiment, the light sensing unit 21 may be a photodiode. The light sensing unit 21 can convert the received optical signal into a photocurrent, and then convert the photocurrent into a photovoltage through I-V. When the photosensitive unit 21 is closer to the light emitting unit 3, the intensity of the fingerprint identification light received by the photosensitive unit 21 corresponding to the position of the transparent cover 11 is higher, the intensity of the fingerprint identification light reflected by the finger F received by the photosensitive unit 21 is higher, the intensity of the fingerprint signal collected by the photosensitive unit 21 is higher, and the output voltage of the photosensitive unit 21 is higher.

Referring to fig. 7, the electronic device 100 further includes a first amplifier 51 and a second amplifier 52. The first amplifier 51 is electrically connected to the first light sensing unit 211. The second amplifier 52 is electrically connected to the second photosensitive unit 212. Specifically, the amplifier (including the first amplifier 51 and the second amplifier 52) may be a circuit having an amplification function for the photocurrent. The photoelectric current generated by the light sensing unit 21 is amplified by an amplifier and then output. The amplifier can increase the gain of the fingerprint recognition light collected by the light sensing unit 21.

Referring to fig. 7, the controller 4 is further configured to generate a preset gain signal and send the preset gain signal to the first amplifier 51, so that the signal gain of the first light sensing unit 211 is a preset gain. The controller 4 is further configured to generate a compensation gain signal according to the target difference, and send the compensation gain signal and the preset gain signal to the second amplifier 52, so that the signal gain of the second photosensitive unit 212 is a target gain, where the target gain is greater than the preset gain. Specifically, the target gain may be a product of the preset gain and a compensation gain, where the compensation gain is a multiple of the fingerprint signal collected by the second photosensitive unit 212, which is generated by the compensation gain signal acting on the second amplifier 52. In practical applications, the preset gain signal and the compensation gain signal may both be voltage signals, and the controller 4 may add the preset gain signal and the compensation gain signal into one signal and send the signal to the second amplifier 52.

For example, after the first photo-sensing unit 211 converts the received fingerprint identification light into the first photocurrent, the controller 4 sends a preset gain signal to the first amplifier 51, so that the first amplifier 51 increases the first photocurrent by m times, where m is greater than 1. In other words, the gain of the fingerprint identification light received by the first light sensing unit 211 is greater than 1 by the preset gain signal, so as to increase the micro-current of the light sensing unit 21, and avoid that the current signal is too weak to facilitate subsequent sampling. It is understood that the magnitude of the first photocurrent may be indicative of the magnitude of the first light intensity of the fingerprint identification light received by the first light sensing unit 211. The larger the first photocurrent is, the larger the first light intensity of the fingerprint identification light received by the first light sensing unit 211 is.

After the second photo sensing unit 212 converts the received fingerprint identification light into the second photocurrent, the controller 4 activates the compensation gain signal corresponding to the target difference according to the target difference between the light intensity of the first photo sensing unit 211 at the corresponding position on the transparent cover 11 and the light intensity of the second photo sensing unit 212 at the corresponding position on the transparent cover 11. The compensation gain signal is used to amplify the second photocurrent by a factor of n. Wherein n is greater than 1. When the compensation gain signal and the preset gain signal are both voltage signals, the compensation gain signal and the preset gain signal can be combined into a voltage signal with a larger amplitude. The controller 4 sends the compensation gain signal and the preset gain signal to the second amplifier 52, reduces the resistance in the second amplifier 52, and increases the amplification factor of the second photo current after passing through the second amplifier 52. When the second photocurrent is transmitted to the second amplifier 52, the second amplifier 52 amplifies the second photocurrent by a factor of m × n.

For example, the first position 113 of the transparent cover 11 receives a light intensity of 100% of the light intensity L emitted by the light-emitting unit 3, and the second position 114 of the transparent cover 11 receives a light intensity of 80% of the light intensity L emitted by the light-emitting unit 3. In the case of no gain, the first photocurrent of the first photo-sensing unit 211 is I, and the second photocurrent of the second photo-sensing unit 212 is 80% I. The controller 4 generates a compensation gain according to the target difference (20% × L), which may be 1.25 times L/(L-20% × L). Under the condition of not counting the influence of fingerprint lines on the light intensity, when the preset gain is 1.1 times, the photocurrent received by the first light sensing unit 211 is 1.1I, and the photocurrent received by the second light sensing unit 212 is 1.1 × 1.25 (80% × I) ═ 1.1I. At this time, the compensation gain can compensate the loss of the intensity of the light emitted to the second position 114, so that no matter the finger F performs fingerprint identification at a position close to the light emitting unit 3 or far away from the light emitting unit 3, the brightness of the fingerprint image collected by the photosensitive array 2 is the same, the fingerprint identification efficiency is improved, and the resolution of the electronic device 100 on the true finger F and the false finger F is also improved.

It should be noted that the above example is given without calculating the influence of the valleys and ridges of the fingerprint pattern on the intensity of light. However, as will be understood by those skilled in the art, in the practical application process, the light may be affected by the valleys and ridges of the fingerprint, i.e., the first photo-sensing current and the second photo-sensing current are different as much as possible, so as to acquire fingerprint patterns with different brightness.

Through setting up the controller 4 acquires that the intensity of the fingerprint identification light that the different positions of printing opacity apron 11 received is different, and generate the compensation gain signal corresponding with this target difference according to the target difference, with the intensity of the fingerprint identification light of compensation and loss gradually along with transmission distance's increase, so that no matter finger F carries out fingerprint identification in the position that is close to in luminescence unit 3 or keeps away from luminescence unit 3, the luminance of the fingerprint image that sensitization array 2 gathered is the same, fingerprint identification efficiency has been improved, electronic equipment 100 has still been improved to true and false finger F's resolution ratio.

Further, the target gain increases as the level amplitude of the compensation gain signal increases; the level amplitude of the compensation gain signal increases as the target difference increases.

Since the intensity of the fingerprint identification light is gradually lost along with the increase of the transmission distance, when the target difference value between the intensity of the second light and the intensity of the first light is larger, the larger the intensity loss of the fingerprint identification light is, the larger the level amplitude of the compensation gain signal should be, so as to compensate the influence of the intensity loss of the fingerprint identification light on the fingerprint signal acquisition. The larger the magnitude of the level of the compensation gain signal, the larger the target gain of the fingerprint signal received by the second photosensitive unit 212.

This embodiment may be applicable to fingerprint recognition light of visible light or infrared light, i.e., the light emitting unit 3 may be a light emitting device that emits visible light or infrared light, for example, a visible light LED, an infrared light LED, or the like.

In a second possible embodiment, referring to fig. 8, the light sensing unit 21 may be a photodiode. The display screen 1 further includes a first switch unit 53 and a second switch unit 54, wherein the first switch unit 53 is electrically connected to the first light sensing unit 211. The first switch unit 53 is turned on to enable the first light sensing unit 211 to collect a light signal. The first switching unit 53 is turned off to stop the first photosensitive unit 211 from collecting the light signal, so the first switching unit 53 is used to control the exposure time (the time to collect the light signal) of the first photosensitive unit 211. The second switch unit 54 is electrically connected to the second photosensitive unit 212. The second switching unit 54 is used to control the exposure time of the second photosensitive unit 212. The second switch unit 54 is a signal control element corresponding to the second photosensitive unit 212.

Referring to fig. 8, the controller 4 is configured to generate a preset exposure signal, send the preset exposure signal to the first switch unit 53, and control the time of starting to collect light and the time of finishing collecting light of the first photosensitive unit 211, so that the exposure time of the first photosensitive unit 211 is the preset exposure time. The controller 4 is further configured to generate a compensation exposure signal according to the target difference, send the compensation exposure signal and the preset exposure signal to the second switch unit 54, and control the time for starting to collect light and the time for ending to collect light of the second photosensitive unit 212, so that the exposure time of the second photosensitive unit 212 is the target exposure time, and the target exposure time is greater than the preset exposure time. When the exposure time of the light sensing unit 21 is longer, the light current converted by the light sensing unit 21 from the fingerprint identification light is larger, and the brightness of the collected fingerprint signal is higher. The target exposure time is the sum of the preset exposure time and the compensation exposure time. The compensation exposure time is the time when the compensation exposure signal acts on the second photosensitive unit 212 to expose the second photosensitive unit 212. In practical applications, the preset exposure signal and the compensation exposure signal may both be voltage signals, and the controller 4 may superimpose the preset exposure signal and the compensation exposure signal into one signal to be sent to the second switch unit 54.

For example, the first position 113 of the transparent cover 11 receives a light intensity of 100% of the light intensity L emitted by the light-emitting unit 3, and the second position 114 of the transparent cover 11 receives a light intensity of 80% of the light intensity L emitted by the light-emitting unit 3. Without considering the influence of fingerprint patterns on the light intensity, it is assumed that the preset exposure time is 100ms, the first photocurrent of the first photosensitive unit 211 in the preset exposure time is I, and the second photocurrent of the second photosensitive unit 212 in the preset exposure time is 80% I. The controller 4 generates a compensation exposure signal according to the target difference (20% L), and the compensation exposure signal and the preset exposure signal control the exposure time of the second photosensitive unit 212 to be 120 ms. At this time, the compensation exposure signal acts on the second photosensitive unit 212 to expose the second photosensitive unit 212 for 20ms, so that the second photocurrent of the second photosensitive unit 212 in the preset exposure time is I. At this time, the compensation exposure time may compensate for the loss of the intensity of the light emitted to the second position 114, so that no matter the finger F performs fingerprint identification at a position close to the light emitting unit 3 or far away from the light emitting unit 3, the brightness of the fingerprint image collected by the photosensitive array 2 is the same, the fingerprint identification efficiency is improved, and the resolution of the electronic device 100 for the true and false fingers F is also improved.

Through setting up the controller 4 acquires that the intensity of the fingerprint identification light that the different positions of printing opacity apron 11 received is different, and generate the compensation exposure signal corresponding with this target difference according to the target difference, with the intensity of the fingerprint identification light of compensation and loss gradually along with transmission distance's increase, so that no matter finger F carries out fingerprint identification in the position that is close to in luminescence unit 3 or keeps away from luminescence unit 3, the luminance of the fingerprint image that sensitization array 2 gathered is the same, fingerprint identification efficiency has been improved, electronic equipment 100 has still been improved to true and false finger F's resolution ratio.

Further, the target exposure time increases with an increase in the level width of the compensation exposure signal; the level width of the compensation exposure signal increases as the target difference increases.

Since the intensity of the fingerprint identification light is gradually lost with the increase of the transmission distance, when the target difference between the second light intensity and the first light intensity is larger, it indicates that the intensity loss of the fingerprint identification light is larger, and the level width of the compensation exposure signal should be larger, so that the time for collecting the light of the second photosensitive unit 212 is increased to compensate the influence of the intensity loss of the fingerprint identification light on the fingerprint signal collection. The larger the level width of the compensation exposure signal is, the larger the target exposure time of the fingerprint signal received by the second photosensitive unit 212 is, and thus the time for the second photosensitive unit 212 to acquire the fingerprint signal is increased.

In the first possible embodiment and the second possible embodiment, when the display screen 1 is a liquid crystal display, the light-emitting unit 3 may be disposed on a backlight of the display screen 1, and when the light-emitting unit 3 is a visible light LED, the visible light LED on the backlight may be used as both a light emitter for emitting the fingerprint identification light and a backlight for displaying on the display screen 1, so as to implement multiplexing of the visible light LED, avoid the need to additionally provide the light-emitting unit 3 for emitting the fingerprint identification light, improve the utilization rate of the structure in the electronic device 100, reduce devices in the electronic device 100, and promote the compactness of the electronic device 100.

When the light emitting unit 3 is an infrared light LED, the infrared light LED may be provided on a flexible circuit board of the backlight together with the visible light LED.

In a third possible embodiment, referring to fig. 9, the display panel 1 is a liquid crystal display. The display screen 1 further comprises a color film substrate 12, a liquid crystal layer 13, liquid crystal electrodes 16 arranged on two opposite sides of the liquid crystal layer 13, a thin film transistor array substrate 14, a light guide plate 15 and a backlight lamp. The light-transmitting cover plate 11 is arranged on one side of the color film substrate 12 departing from the liquid crystal layer 13. The liquid crystal layer 13 is sealed between the color film substrate 12 and the thin film transistor array substrate 14. The light guide plate 15 is disposed on a side of the tft array substrate 14 facing away from the liquid crystal layer 13. The backlight comprises a strip-shaped flexible circuit board and a plurality of visible light LEDs arranged on the flexible circuit board. The backlight is provided on a side surface of the light guide plate 15. The backlight and the light guide plate 15 may be arranged in the Y-axis direction. The flexible circuit board in a bar shape may extend in the X-axis direction. In this embodiment, the backlight is provided on one side of the light guide plate 15. In other embodiments, a plurality of backlights may be provided on multiple sides of the light guide plate 15. The color filter substrate 12, the liquid crystal layer 13, the thin film transistor array substrate 14, and the light guide plate 15 face the light-transmitting portion 111. The photosensitive array 2 is arranged on the thin film transistor array substrate 14 of the display screen 1. The liquid crystal electrode 16 corresponding to the second light sensing unit 212 is a signal control element corresponding to the second light sensing unit 212. The liquid crystal electrode 16 corresponding to the first light sensing unit 211 is the liquid crystal electrode 16 disposed in a region directly above the first light sensing unit 211 (the area of the region is larger than that of the first light sensing unit 211). The liquid crystal electrode 16 corresponding to the second light sensing unit 212 is the liquid crystal electrode 16 disposed in a region directly above the second light sensing unit 212 (the region has an area larger than that of the second light sensing unit 212).

For convenience of description, the liquid crystal electrode 16 corresponding to the first photosensitive unit 211 is defined as a first liquid crystal electrode 161. The liquid crystal electrode 16 corresponding to the second photosensitive unit 212 is defined as the second liquid crystal electrode 162.

In the present application, the light emitting unit 3 may be a visible light LED on a backlight, and the visible light LED may be used as both a light emitter for emitting the fingerprint identification light and a backlight source for displaying on the display screen 1, so as to realize multiplexing of the visible light LED, avoid the need to additionally provide the light emitting unit 3 for emitting the fingerprint identification light, improve the utilization rate of the structure in the electronic device 100, reduce devices in the electronic device 100, and promote the compactness of the electronic device 100.

Light emitted by the light emitting unit 3 is emitted through the light guide plate 15, the thin film transistor array substrate 14, the liquid crystal layer 13, the color film substrate 12 and the light-transmitting cover plate 11.

Referring to fig. 10 and 11, the controller 4 is further configured to generate a preset voltage signal and send the preset voltage signal to the first liquid crystal electrode 161, so that the liquid crystal molecules corresponding to the first light sensing unit 211 are deflected by a first angle θ relative to the Z axis₁Further, the liquid crystal molecules corresponding to the first light sensing unit 211 have a first transmittance for the fingerprint identification light. The liquid crystal electrode 16 corresponding to the first light sensing unit 211 is the liquid crystal electrode 16 disposed in a region directly above the first light sensing unit 211 (the area of the region is larger than that of the first light sensing unit 211).

Referring to fig. 10 and 11, the controller 4 is further configured to generate the compensation voltage signal according to the preset voltage signal and the target difference, and send the compensation voltage signal and the preset voltage signal to the second liquid crystal electrode 162, so that the liquid crystal molecules corresponding to the second photosensitive unit 212 are deflected by a second angle θ with respect to the Z axis₂And further, the liquid crystal molecules corresponding to the second photosensitive unit 212 have a second transmittance for the fingerprint identification light. Wherein the second angle theta₂Less than the first angleθ₁So that the second transmittance is greater than the first transmittance. In practical applications, the preset voltage signal and the compensation voltage signal are both voltage signals, and the controller 4 may superimpose the preset voltage signal and the compensation voltage signal into one signal to be sent to the liquid crystal electrode 16 corresponding to the second light sensing unit 212.

In the case that the transmittances of the liquid crystal molecules of the first photosensitive unit 211 and the second photosensitive unit 212 for the fingerprint identification light are the same, since the light intensity gradually attenuates with the increase of the distance, the first photosensitive unit 211 is closer to the light emitting unit 3 relative to the second photosensitive unit 212, and the light intensity of the first photosensitive unit 211 corresponding to the first position 113 of the light-transmitting cover 11 is greater than the light intensity of the second photosensitive unit 212 corresponding to the second position 114 of the light-transmitting cover 11.

Sending a preset voltage signal to the liquid crystal electrode 16 portion corresponding to the first light sensing unit 211 through the controller 4, wherein the preset voltage signal controls the deflection angle of the liquid crystal molecules so that the liquid crystal molecules corresponding to the first light sensing unit 211 have a first transmittance for the fingerprint identification light; the controller 4 generates a compensation voltage signal on the basis of the preset voltage signal according to the target difference value. The compensation voltage signal is a voltage signal, and the voltage amplitude of the compensation voltage signal is greater than the voltage amplitude of the preset voltage signal. The controller 4 sends the compensation voltage signal to the liquid crystal electrode 16 portion corresponding to the second photosensitive unit 212, the compensation voltage signal controls the deflection angle of the liquid crystal molecules, so that the liquid crystal molecules corresponding to the second photosensitive unit 212 have a second transmittance for the fingerprint identification light, and the second transmittance is greater than the first transmittance, so as to compensate the attenuation of the light in the transmission process, and finally, the fingerprint identification light is transmitted to the first position 113 of the light-transmitting cover plate 11 corresponding to the first photosensitive unit 211 and transmitted to the second position 114 of the light-transmitting cover plate 11 corresponding to the second photosensitive unit 212, and the light intensity is the same, so as to compensate the influence of the attenuation of the emitted fingerprint identification light along with the transmission distance on the fingerprint signal collected by the photosensitive unit 21, thereby improving the efficiency of fingerprint identification, and also improving the resolution accuracy of the true finger F.

Further, the second transmittance increases with an increase in the level amplitude of the compensation voltage signal; the level amplitude of the compensation voltage signal increases as the target difference increases.

Since the intensity of the fingerprint identification light is gradually lost along with the increase of the transmission distance, when the target difference value between the intensity of the second light and the intensity of the first light is larger, the intensity loss of the fingerprint identification light is larger, and the level amplitude of the compensation voltage signal is also larger, so as to make up the influence of the intensity loss of the fingerprint identification light on fingerprint signal acquisition. The larger the amplitude of the level of the compensation voltage signal is, the larger the second transmittance is.

This embodiment may be suitable for fingerprint recognition light of visible light, i.e. the light emitting unit 3 may be a light emitting device emitting visible light, e.g. a visible light LED.

In a fourth possible embodiment, the first possible embodiment and the second possible embodiment are combined to form a solution. Reference may be made in detail to the contents of the first possible embodiment and the second possible embodiment.

Referring to fig. 12, the controller 4 is further configured to generate a preset gain signal and a preset exposure signal, and send the preset gain signal and the preset exposure signal to the first light sensing unit 211, so that the signal gain of the first light sensing unit 211 is a preset gain, and the exposure time is a preset exposure time. For example, the first photocurrent of the first photo-sensing unit 211 under the preset gain signal (1.1 times) and the preset exposure time (100ms) is I₁。

Referring to fig. 12, the controller 4 is further configured to generate a compensation gain signal and a compensation exposure signal according to the target difference, and the controller 4 sends the compensation gain signal and a preset gain signal to the second amplifier 52 to make the gain of the second light sensing unit 212 be a target gain, and sends the compensation exposure signal and the target exposure signal to the second switch unit 54 to make the exposure time of the second light sensing unit 212 be a target exposure time. In practical applications, the preset gain signal and the compensation gain signal may both be voltage signals, and the controller 4 may apply the preset gain signal and the compensation gain signalThe gain signals are added to form a signal which is sent to the second amplifier 52. The preset exposure signal and the compensation exposure signal may both be voltage signals, and the controller 4 may superimpose the preset exposure signal and the compensation exposure signal into one signal to be sent to the second switching unit 54. For example, without considering the influence of the fingerprint pattern on the light intensity, the target gain (1.2 times) of the second photosensitive unit 212 and the second photocurrent at the target exposure time (120ms) are I₁。

The controller 4 compensates the loss of the light intensity emitted to the second position 114 by performing the gain compensation and the exposure time compensation at the same time, so that no matter the finger F performs the fingerprint identification at the position close to the light emitting unit 3 or far away from the light emitting unit 3, the brightness of the fingerprint image collected by the photosensitive array 2 is the same, the fingerprint identification efficiency is improved, and the resolution of the electronic device 100 to the true finger F and the false finger F is also improved.

When the gain of the fingerprint signal received by the second photosensitive unit 212 is increased, the background noise signal in the fingerprint signal is also increased accordingly, which is not favorable for extracting the fingerprint image from the fingerprint signal. And increase exposure time, can improve the whole luminance of fingerprint image in the fingerprint signal, so controller 4 can avoid the too big problem that leads to the background noise of gain compensation through carrying out gain compensation and exposure time compensation simultaneously, can also increase the whole luminance of fingerprint image through increasing exposure time, and then do benefit to and draw the fingerprint image in the fingerprint signal, improve the identification efficiency of fingerprint signal.

In a fifth possible embodiment, the first possible embodiment and the third possible embodiment are combined to form a solution. Reference may be made in detail to the contents of the first possible embodiment and the third possible embodiment.

Referring to fig. 13, the controller 4 is further configured to generate a preset gain signal and a preset voltage signal, transmit the preset gain signal to the first amplifier 51, and send the preset voltage signal to the liquid crystal electrode 16 corresponding to the first light sensing unit 211, so that the signal gain of the first light sensing unit 211 is a preset gain, and the first light sensing unit 211 is a first light sensing unit 211The corresponding liquid crystal electrode 16 controls the transmittance of the liquid crystal molecules to the fingerprint identification light to be a first transmittance by controlling the deflection angle of the liquid crystal molecules. For example, the first photocurrent of the first photo-sensing unit 211 under the preset gain signal and the preset exposure time is I₁。

Referring to fig. 13, the controller 4 is further configured to generate a compensation gain signal and a compensation voltage signal according to the target difference, and the controller 4 sends the compensation gain signal and a preset gain signal to the second amplifier 52, so that the gain of the second light sensing unit 212 is a target gain, and sends the compensation voltage signal and the preset voltage signal to the liquid crystal electrode 16 corresponding to the second light sensing unit 212, so that the liquid crystal electrode 16 corresponding to the second light sensing unit 212 controls the transmittance of the liquid crystal molecules to the fingerprint identification light to be the second transmittance by controlling the deflection angle of the liquid crystal molecules. The second transmittance is greater than the first transmittance. In practical applications, the preset gain signal and the compensation gain signal may both be voltage signals, and the controller 4 may add the preset gain signal and the compensation gain signal into one signal and send the signal to the second amplifier 52. The preset voltage signal and the compensation voltage signal are both voltage signals, and the controller 4 may superimpose the preset voltage signal and the compensation voltage signal into one signal to be sent to the liquid crystal electrode 16 corresponding to the second light sensing unit 212. For example, without considering the influence of fingerprint lines on the light intensity, the second photocurrent of the second light sensing unit 212 when the target gain and the transmittance of the liquid crystal molecules corresponding to the second light sensing unit 212 for the fingerprint identification light are the second transmittance is I₁。

The controller 4 compensates for the loss of the intensity of the light emitted to the second position 114 by performing gain compensation and increasing the deflection angle of the liquid crystal molecules (so that the included angle between the liquid crystal molecules and the Z axis is smaller) at the same time, so that no matter the finger F performs fingerprint identification at a position close to the light emitting unit 3 or far from the light emitting unit 3, the brightness of the fingerprint image collected by the photosensitive array 2 is the same, the fingerprint identification efficiency is improved, and the resolution of the electronic device 100 for the true finger F and the false finger F is also improved.

When the gain of the fingerprint signal received by the second photosensitive unit 212 is increased, the background noise signal in the fingerprint signal is also increased accordingly, which is not favorable for extracting the fingerprint image from the fingerprint signal. And the deflection voltage of the liquid crystal molecules corresponding to the second photosensitive unit 212 is increased, so that the overall brightness of the fingerprint image in the fingerprint signal can be improved, the controller 4 can avoid the problem of overlarge background noise caused by overlarge gain compensation by simultaneously performing gain compensation and deflection voltage compensation, the overall brightness of the fingerprint image can be increased by increasing the liquid crystal analysis deflection voltage, the fingerprint image can be favorably extracted from the fingerprint signal, and the identification efficiency of the fingerprint signal is improved.

In a sixth possible embodiment, the second possible embodiment and the third possible embodiment are combined to form a solution. Reference may be made in detail to the contents of the second possible embodiment and the third possible embodiment.

Referring to fig. 14, the controller 4 is further configured to generate a preset exposure signal and a preset voltage signal, transmit the preset exposure signal to the first switch unit 53, and send the preset voltage signal to the liquid crystal electrode 16 corresponding to the first light sensing unit 211, so that the exposure time of the first light sensing unit 211 is the preset exposure time, and the liquid crystal electrode 16 corresponding to the first light sensing unit 211 controls the transmittance of the liquid crystal molecules to the fingerprint identification light to be the first transmittance by controlling the deflection angle of the liquid crystal molecules. For example, the first photocurrent of the first photo-sensing unit 211 under the preset exposure signal and the preset exposure time is I1.

Referring to fig. 14, the controller 4 is further configured to generate a compensation exposure signal and a compensation voltage signal according to the target difference, and the controller 4 sends a preset exposure signal and the target exposure signal to the second switch unit 54, so that the exposure time of the second light sensing unit 212 is the target exposure time, and sends the preset voltage signal and the compensation voltage signal to the liquid crystal electrode 16 corresponding to the second light sensing unit 212, so that the liquid crystal electrode 16 corresponding to the second light sensing unit 212 controls the transmittance of the liquid crystal molecules to the fingerprint identification light to be the second transmittance by controlling the deflection angle of the liquid crystal molecules. The second transmittance is greater than the first transmittance. In practical applications, the preset exposure signal and the compensation exposure signal may both be voltage signals, and the controller 4 may superimpose the preset exposure signal and the compensation exposure signal into one signal to be sent to the second switch unit 54. The preset voltage signal and the compensation voltage signal are both voltage signals, and the controller 4 may superimpose the preset voltage signal and the compensation voltage signal into one signal to be sent to the liquid crystal electrode 16 corresponding to the second light sensing unit 212.

For example, without considering the influence of the fingerprint texture on the light intensity, the second photocurrent of the second light sensing unit 212 under the target exposure signal and the transmittance of the liquid crystal molecules corresponding to the second light sensing unit 212 to the fingerprint identification light is I1. At this time, the controller 4 compensates the loss of the intensity of the light emitted to the second position 114 by simultaneously performing the exposure time compensation and increasing the deflection angle of the liquid crystal molecules (so that the included angle between the liquid crystal molecules and the Z axis is smaller), so that no matter the finger F performs the fingerprint recognition at the position close to the light emitting unit 3 or far from the light emitting unit 3, the brightness of the fingerprint image collected by the photosensitive array 2 is the same, the fingerprint recognition efficiency is improved, and the resolution of the electronic device 100 to the real and false fingers F is also improved.

It is understood that the light emitting unit 3 may be located on the backlight light bar. The fingerprint identification light emitted by the light-emitting unit 3 is visible light or infrared light. Specifically, the fingerprint identification light emitted by the light emitting unit 3 is visible light or infrared light, and can be selected according to actual conditions.

In other embodiments, the first possible embodiment, the second possible embodiment and the third possible embodiment may be combined, that is, the controller 4 compensates the loss of the intensity of the light emitted to the second position 114 by compensating the signal gain of the second photosensitive unit 212, the exposure time of the fingerprint signal collected by the second photosensitive unit 212 and the deflection voltage of the liquid crystal corresponding to the second photosensitive unit 212.

Referring to fig. 15 in combination with fig. 1 to fig. 6, a control method of an electronic device 100 is provided in the present application, and the control method is applied to the electronic device 100 provided in any of the above embodiments. The electronic device 100 mainly includes a display screen 1, a controller 4, a light-emitting unit 3, and a photosensitive array 2 integrated in the display screen 1. The light emitting unit 3 is used for emitting fingerprint identification light. The fingerprint identification light is used for being received by the photosensitive array 2 after being reflected by the finger F so as to form a fingerprint signal. The method comprises the following steps:

in operation 101, the controller 4 obtains a target difference between the light intensity of the fingerprint identification light transmitted to the first position 113 on the transparent cover 11 of the display screen 1 and the light intensity of the second position 114, where the first position 113 corresponds to the first photosensitive unit 211 in the photosensitive array 2, and the second position 114 corresponds to the second photosensitive unit 212 in the photosensitive array 2.

In operation 102, the controller 4 generates a compensation signal according to the target difference, and transmits the compensation signal to a signal control element corresponding to the second photosensitive unit 212, so as to perform signal compensation on the fingerprint signal collected by the second photosensitive unit 212.

In this embodiment, the wavelength band of the fingerprint identification light may be a visible light wavelength band or an infrared light wavelength band.

The operations 101 to 102 may refer to the detailed description of the electronic device 100 provided in any one of the above possible embodiments, and are not repeated herein.

Further, the first position 113 is a position where the intensity of the light received by the light-transmitting cover plate 11 of the display screen 1 is maximum.

Referring to fig. 7 and fig. 16, a second embodiment of the present application provides a control method for an electronic device 100, which is the electronic device 100 provided in the first possible embodiment. Specifically, reference is made to the detailed description of the electronic device 100 provided in the first possible embodiment, which is not repeated herein.

In operation 201, the controller 4 obtains a target difference between the light intensity of the fingerprint identification light transmitted to the first position 113 on the transparent cover 11 of the display screen 1 and the light intensity of the second position 114, where the first position 113 corresponds to the first photosensitive unit 211 in the photosensitive array 2, and the second position 114 corresponds to the second photosensitive unit 212 in the photosensitive array 2. The specific steps may refer to operation 101, and are not described herein again.

In operation 202, the controller 4 generates a preset gain signal and sends the preset gain signal to the first amplifier 51, so that the signal gain of the first photosensitive unit 211 is a preset gain.

In operation 203, the controller 4 generates a compensation gain signal according to the target difference, and sends the compensation gain signal and the preset gain signal to the second amplifier 52, so that the signal gain of the second photosensitive unit 212 is a target gain, and the target gain is greater than the preset gain.

The operations 201 to 203 may refer to the detailed description of the electronic device 100 provided in the first possible embodiment, and are not described herein again.

Referring to fig. 8 and fig. 17, a third implementation of the present application provides a control method for an electronic device 100, which is the electronic device 100 provided in the second possible implementation. Specifically, with reference to the detailed description of the electronic device 100 provided in the second possible implementation, details about the specific structure of the electronic device 100 are not repeated herein.

The controller 4 generates a compensation signal according to the target difference, and transmits the compensation signal to a signal control element corresponding to the second photosensitive unit 212, so as to perform signal compensation on the fingerprint signal acquired by the second photosensitive unit 212, including:

in operation 301, the controller 4 obtains a target difference between the light intensity of the fingerprint identification light transmitted to the first position 113 on the transparent cover 11 of the display screen 1 and the light intensity of the second position 114, where the first position 113 corresponds to the first photosensitive unit 211 in the photosensitive array 2, and the second position 114 corresponds to the second photosensitive unit 212 in the photosensitive array 2. The specific steps may refer to operation 101, and are not described herein again.

In operation 302, the controller 4 generates a preset exposure signal and sends the preset exposure signal to the first switch unit 53, so that the exposure time of the first photosensitive unit 211 is the preset exposure time.

In operation 303, the controller 4 generates a compensation exposure signal according to the target difference, and sends the compensation exposure signal and the preset exposure signal to the second switch unit 54, so that the exposure time of the second photosensitive unit 212 is a target exposure time, and the target exposure time is greater than the preset exposure time.

The operations 301 to 303 can refer to the detailed description of the electronic device 100 provided in the second possible embodiment, and are not described herein again.

Referring to fig. 9 and fig. 18, a fourth embodiment of the present application provides a control method for an electronic apparatus 100, which is applied to the electronic apparatus 100 provided in the third possible embodiment. Specifically, with reference to the detailed description of the electronic device 100 provided in the third possible embodiment, details about the specific structure of the electronic device 100 are not repeated herein.

In operation 401, the controller 4 obtains a target difference between the light intensity of the fingerprint identification light transmitted to the first position 113 on the transparent cover 11 of the display screen 1 and the light intensity of the second position 114, where the first position 113 corresponds to the first photosensitive unit 211 in the photosensitive array 2, and the second position 114 corresponds to the second photosensitive unit 212 in the photosensitive array 2. The specific steps may refer to operation 101, and are not described herein again.

In operation 402, the controller 4 generates a preset voltage signal and sends the preset voltage signal to the liquid crystal electrode 16 corresponding to the first light sensing unit 211, so as to control the liquid crystal molecules corresponding to the first light sensing unit 211 to have a first transmittance for the fingerprint identification light.

In operation 403, the controller 4 generates a compensation voltage signal according to the target difference, and sends the compensation voltage signal and the preset voltage signal to the liquid crystal electrode 16 corresponding to the second light sensing unit 212, so that the liquid crystal molecules corresponding to the second light sensing unit 212 have a second transmittance for the fingerprint identification light, where the second transmittance is greater than the first transmittance.

In this embodiment, the wavelength band of the fingerprint identification light may be a visible light wavelength band.

The operations 401 to 403 may refer to the detailed description of the electronic device 100 provided in the third possible embodiment, and are not described herein again.

Further, the second transmittance increases as a level amplitude of the compensation voltage signal increases, and the level amplitude of the compensation voltage signal increases as the target difference increases.

Referring to fig. 11 and fig. 19 together, a fifth embodiment of the present invention provides a method for controlling an electronic apparatus 100, which is applied to the electronic apparatus 100 provided in the fourth possible embodiment. Specifically, with reference to the detailed description of the electronic device 100 provided in the fourth possible embodiment, details about the specific structure of the electronic device 100 are not repeated herein.

In operation 501, the controller 4 obtains a target difference between the light intensity of the fingerprint identification light transmitted to the first position 113 on the transparent cover 11 of the display screen 1 and the light intensity of the second position 114, where the first position 113 corresponds to the first photosensitive unit 211 in the photosensitive array 2, and the second position 114 corresponds to the second photosensitive unit 212 in the photosensitive array 2. The specific steps may refer to operation 101, and are not described herein again.

In operation 502, the controller 4 generates a preset gain signal and a preset exposure signal, and sends the preset gain signal and the preset exposure signal to the first light sensing unit 211, so that the signal gain of the first light sensing unit 211 is a preset gain, and the exposure time of the first light sensing unit 211 is a preset exposure time.

In operation 503, the controller 4 is further configured to generate a compensation gain signal and a compensation exposure signal according to the target difference, and the controller 4 sends the compensation gain signal and a preset gain signal to the second amplifier 52 so that the gain of the second photosensitive unit 212 is the target gain, and sends the compensation exposure signal and the target exposure signal to the second switch unit 54 so that the exposure time of the second photosensitive unit 212 is the target exposure time.

The operations 501 to 503 can refer to the detailed description of the electronic device 100 provided in the fourth possible embodiment, and are not described herein again.

The controller 4 compensates the loss of the light intensity emitted to the second position 114 by performing the gain compensation and the exposure time compensation at the same time, so that no matter the finger F performs the fingerprint identification at the position close to the light emitting unit 3 or far away from the light emitting unit 3, the brightness of the fingerprint image collected by the photosensitive array 2 is the same, the fingerprint identification efficiency is improved, and the resolution of the electronic device 100 to the true finger F and the false finger F is also improved. The controller 4 can avoid the problem that the gain compensation is too large and the background noise is too large by simultaneously performing the gain compensation and the exposure time compensation, and can also increase the overall brightness of the fingerprint image by increasing the exposure time, thereby being beneficial to extracting the fingerprint image from the fingerprint signal and improving the identification efficiency of the fingerprint signal.

Referring to fig. 12 and fig. 20, a sixth implementation of the present application provides a method for controlling an electronic apparatus 100, which is the electronic apparatus 100 provided in the fifth possible implementation. Specifically, with reference to the detailed description of the electronic device 100 provided in the fifth possible embodiment, details about the specific structure of the electronic device 100 are not repeated herein.

In operation 601, the controller 4 obtains a target difference between the light intensity of the fingerprint identification light transmitted to the first position 113 on the transparent cover 11 of the display screen 1 and the light intensity of the second position 114, where the first position 113 corresponds to the first photosensitive unit 211 in the photosensitive array 2, and the second position 114 corresponds to the second photosensitive unit 212 in the photosensitive array 2. The specific steps may refer to operation 101, and are not described herein again.

In operation 602, the controller 4 generates a preset gain signal and a preset voltage signal, transmits the preset gain signal to the first amplifier 51, and sends the preset voltage signal to the liquid crystal electrode 16 corresponding to the first light sensing unit 211, so that the signal gain of the first light sensing unit 211 is the preset gain, and the liquid crystal electrode 16 corresponding to the first light sensing unit 211 controls the transmittance of the liquid crystal molecules to the fingerprint identification light to be the first transmittance by controlling the deflection angle of the liquid crystal molecules.

In operation 603, the controller 4 is further configured to generate a compensation gain signal and a compensation voltage signal according to the target difference, and the controller 4 sends the compensation gain signal and a preset gain signal to the second amplifier 52, so that the gain of the second light sensing unit 212 is a target gain, and sends the compensation voltage signal and a preset voltage signal to the liquid crystal electrode 16 corresponding to the second light sensing unit 212, so that the liquid crystal electrode 16 corresponding to the second light sensing unit 212 controls the transmittance of the liquid crystal molecules to the fingerprint identification light to be a second transmittance by controlling the deflection angle of the liquid crystal molecules. The second transmittance is greater than the first transmittance.

For the operations 601 to 603, reference may be made to the detailed description of the electronic device 100 provided in the fifth possible embodiment, which is not described herein again.

The controller 4 compensates for the loss of the intensity of the light emitted to the second position 114 by performing gain compensation and increasing the deflection angle of the liquid crystal molecules (so that the included angle between the liquid crystal molecules and the Z axis is smaller) at the same time, so that no matter the finger F performs fingerprint identification at a position close to the light emitting unit 3 or far from the light emitting unit 3, the brightness of the fingerprint image collected by the photosensitive array 2 is the same, the fingerprint identification efficiency is improved, and the resolution of the electronic device 100 for the true finger F and the false finger F is also improved. The controller 4 can avoid the problem of overlarge background noise caused by overlarge gain compensation by simultaneously performing gain compensation and deflection voltage compensation, and can also increase the overall brightness of the fingerprint image by increasing the liquid crystal analysis deflection voltage, thereby being beneficial to extracting the fingerprint image from the fingerprint signal and improving the identification efficiency of the fingerprint signal.

Referring to fig. 13 and fig. 21, a seventh implementation of the present application provides a method for controlling an electronic apparatus 100, which is applied to the electronic apparatus 100 provided in the sixth possible implementation. Specifically, with reference to the detailed description of the electronic device 100 provided in the sixth possible implementation manner, details about the specific structure of the electronic device 100 are not repeated herein.

In operation 701, the controller 4 obtains a target difference between the light intensity of the fingerprint identification light transmitted to the first position 113 on the transparent cover 11 of the display screen 1 and the light intensity of the second position 114, where the first position 113 corresponds to the first photosensitive unit 211 in the photosensitive array 2, and the second position 114 corresponds to the second photosensitive unit 212 in the photosensitive array 2. The specific steps may refer to operation 101, and are not described herein again.

In operation 702, the controller 4 generates a preset exposure signal and a preset voltage signal, transmits the preset exposure signal to the first switch unit 53, and sends the preset voltage signal to the liquid crystal electrode 16 corresponding to the first light sensing unit 211, so that the exposure time of the first light sensing unit 211 is the preset exposure time, and the liquid crystal electrode 16 corresponding to the first light sensing unit 211 controls the transmittance of the liquid crystal molecules to the fingerprint identification light to be the first transmittance by controlling the deflection angle of the liquid crystal molecules.

Operation 703 and the controller 4 are further configured to generate a compensation exposure signal and a compensation voltage signal according to the target difference, and the controller 4 sends a preset exposure signal and the target exposure signal to the second switch unit 54, so that the exposure time of the second photosensitive unit 212 is the target exposure time, and sends the preset voltage signal and the compensation voltage signal to the liquid crystal electrode 16 corresponding to the second photosensitive unit 212, so that the liquid crystal electrode 16 corresponding to the second photosensitive unit 212 controls the transmittance of the liquid crystal molecules to the fingerprint identification light to be the second transmittance by controlling the deflection angle of the liquid crystal molecules. The second transmittance is greater than the first transmittance.

The operations 701 to 703 may refer to the detailed description of the electronic device 100 provided in the fifth possible embodiment, and are not repeated herein.

The controller 4 compensates the loss of the intensity of the light emitted to the second position 114 by simultaneously performing the exposure time compensation and increasing the deflection angle of the liquid crystal molecules (so that the included angle between the liquid crystal molecules and the Z axis is smaller), so that no matter the finger F performs fingerprint identification at a position close to the light emitting unit 3 or far away from the light emitting unit 3, the brightness of the fingerprint image collected by the photosensitive array 2 is the same, the fingerprint identification efficiency is improved, and the resolution of the electronic device 100 on the true finger F and the false finger F is also improved.

In other embodiments, the first embodiment, the second embodiment and the third embodiment may be combined, that is, the controller 4 compensates the loss of the intensity of the light emitted to the second position 114 by compensating the signal gain of the second photosensitive unit 212, the exposure time of the fingerprint signal collected by the second photosensitive unit 212 and the deflection voltage of the liquid crystal corresponding to the second photosensitive unit 212.

While the foregoing is directed to embodiments of the present application, it will be appreciated by those skilled in the art that various changes and modifications may be made without departing from the principles of the application, and it is intended that such changes and modifications be covered by the scope of the application.

Claims

1. The control method of the electronic equipment is characterized in that the electronic equipment comprises a display screen, a controller, a light-emitting unit and a photosensitive array integrated in the display screen, wherein the light-emitting unit is used for emitting fingerprint identification light rays, and the fingerprint identification light rays are received by the photosensitive array after being reflected by fingers so as to form fingerprint signals; the method comprises the following steps:

the controller obtains a target difference value between the light intensity of a first position and the light intensity of a second position on a light-transmitting cover plate of the display screen, wherein the fingerprint identification light is transmitted to the first light-sensing unit in the light-sensing array, and the second position corresponds to a second light-sensing unit in the light-sensing array; and the controller generates a compensation signal according to the target difference value, and transmits the compensation signal to a signal control element corresponding to the second photosensitive unit so as to perform signal compensation on the fingerprint signal acquired by the second photosensitive unit, wherein the compensation signal is at least one of a compensation current gain signal, a compensation exposure time signal and a compensation voltage signal applied to a liquid crystal electrode of the display screen.

2. The method of claim 1, wherein the first position is a position on a transparent cover of the display screen where the intensity of the received light is greatest.

3. The method of claim 1, wherein the display screen further comprises a first amplifier and a second amplifier, the first amplifier electrically connected to the first photosensing unit and the second amplifier electrically connected to the second photosensing unit;

the controller generates a compensation signal according to the target difference value, and transmits the compensation signal to a signal control element corresponding to the second photosensitive unit to perform signal compensation on the fingerprint signal acquired by the second photosensitive unit, including:

the controller generates a preset gain signal and sends the preset gain signal to the first amplifier so as to enable the signal gain of the first photosensitive unit to be a preset gain;

the controller generates a compensation gain signal according to the target difference value, and sends the compensation gain signal and the preset gain signal to the second amplifier, so that the signal gain of the second photosensitive unit is a target gain, and the target gain is larger than the preset gain.

4. The method of claim 3, wherein the target gain increases as a level amplitude of the compensation gain signal increases; the level amplitude of the compensation gain signal increases as the target difference increases.

5. The method according to any one of claims 1 to 4, wherein the display screen further comprises a first switch unit and a second switch unit, the first switch unit being electrically connected to the first photosensitive unit, the second switch unit being electrically connected to the second photosensitive unit;

the controller generates a compensation signal according to the target difference value, and transmits the compensation signal to a signal control element corresponding to the second photosensitive unit so as to perform signal compensation on the fingerprint signal acquired by the second photosensitive unit, and the method comprises the following steps:

the controller generates a preset exposure signal and sends the preset exposure signal to the first switch unit so as to enable the exposure time of the first photosensitive unit to be the preset exposure time;

the controller generates a compensation exposure signal according to the target difference value, and sends the compensation exposure signal and the preset exposure signal to the second switch unit, so that the exposure time of the second photosensitive unit is the target exposure time, and the target exposure time is longer than the preset exposure time.

6. The method according to claim 5, wherein the target exposure time increases as a level width of the compensation exposure signal increases; the level width of the compensation exposure signal increases as the target difference increases.

7. The method of any one of claims 1 to 3, wherein the display further comprises a liquid crystal layer and liquid crystal electrodes disposed on opposite sides of the liquid crystal layer; the liquid crystal electrode corresponding to the second photosensitive unit is a signal control element corresponding to the second photosensitive unit;

the controller generates a preset voltage signal and sends the preset voltage signal to the liquid crystal electrode corresponding to the first photosensitive unit so as to control liquid crystal molecules corresponding to the first photosensitive unit to have a first transmittance for the fingerprint identification light;

the controller generates a compensation voltage signal according to the target difference value, and sends the compensation voltage signal and the preset voltage signal to the liquid crystal electrode corresponding to the second photosensitive unit, so that liquid crystal molecules corresponding to the second photosensitive unit have a second transmittance for the fingerprint identification light, and the second transmittance is greater than the first transmittance.

8. The method of claim 7, wherein the second transmittance increases with an increase in a magnitude of a level of the compensation voltage signal, the magnitude of the level of the compensation voltage signal increasing with an increase in the target difference.

9. The method of claim 1, wherein the fingerprint identification light is in a visible light band or an infrared light band.

10. An electronic device, comprising:

the controller is electrically connected to the photosensitive array and used for acquiring a target difference value between the light intensity of the fingerprint identification light transmitted to the first position and the light intensity of the second position, generating a compensation signal according to the target difference value, and transmitting the compensation signal to a signal control element corresponding to the second photosensitive unit so as to perform signal compensation on the fingerprint signal acquired by the second photosensitive unit, wherein the compensation signal is at least one of a compensation current gain signal, a compensation exposure time signal and a compensation voltage signal applied to a liquid crystal electrode of the display screen.

11. The electronic device of claim 10, wherein the first position is a position on a light-transmissive cover of the display screen where the intensity of light received is greatest.

12. The electronic device of claim 10, wherein the display screen further comprises a first amplifier and a second amplifier, the first amplifier being electrically connected to the first light sensing unit, the second amplifier being electrically connected to the second light sensing unit; the controller is further used for generating a preset gain signal and sending the preset gain signal to the first amplifier so that the signal gain of the first photosensitive unit is a preset gain; the controller is further configured to generate a compensation gain signal according to the target difference value, and send the compensation gain signal and the preset gain signal to the second amplifier, so that the signal gain of the second light sensing unit is a target gain, and the target gain is greater than the preset gain.

13. The electronic device according to any one of claims 10 to 12, wherein the display screen further comprises a first switch unit and a second switch unit, the first switch unit is electrically connected to the first light sensing unit, the second switch unit is electrically connected to the second light sensing unit, and the controller is further configured to generate a preset exposure signal and send the preset exposure signal to the first switch unit, so that the exposure time of the first light sensing unit is a preset exposure time; the controller is further configured to generate a compensation exposure signal according to the target difference value, and send the compensation exposure signal and the preset exposure signal to the second switch unit, so that the exposure time of the second photosensitive unit is a target exposure time, and the target exposure time is longer than the preset exposure time.

14. The electronic device according to any one of claims 10 to 12, wherein the display further comprises a liquid crystal layer and liquid crystal electrodes disposed on opposite sides of the liquid crystal layer; the controller is further used for generating a preset voltage signal and sending the preset voltage signal to the liquid crystal electrode corresponding to the first photosensitive unit so as to control liquid crystal molecules corresponding to the first photosensitive unit to have a first transmittance for the fingerprint identification light; the controller is further used for generating a compensation voltage signal according to the target difference value, and sending the compensation voltage signal and the preset voltage signal to the liquid crystal electrode corresponding to the second photosensitive unit, so that liquid crystal molecules corresponding to the second photosensitive unit have a second transmittance for the fingerprint identification light, and the second transmittance is greater than the first transmittance.

15. The electronic device of claim 10, further comprising a backlight light bar, wherein the light-emitting unit is located on the backlight light bar, and the fingerprint identification light emitted by the light-emitting unit is visible light or infrared light.