CN110532972B - Electronic device and fingerprint image acquisition method - Google Patents

Abstract

The present application provides an electronic device, including a display panel and a light-emitting assembly, the display panel has a fingerprint identification area corresponding to an optical sensor, the light-emitting assembly emits light in the fingerprint identification area to form a target light spot, and the target light spot The brightness of the first sub-edge region of the edge region is less than the brightness of the second sub-edge region of the edge region of the target light spot, wherein the first sub-edge region is the edge region along the polarized light of the display panel The second sub-edge region is the region where the edge region is located outside the first sub-edge region, so that even if the light reflected to the optical sensor based on the second sub-edge region is weakened by the polarizer, The difference between the brightness and the brightness of the first sub-edge region is also smaller or even the same, so that the quality of the fingerprint image obtained by the electronic device based on the target light spot is higher.

Description

Electronic device and fingerprint image acquisition method

technical field

The present application relates to the technical field of electronic devices, and in particular, to an electronic device and a fingerprint image acquisition method.

Background technique

With the development of full-screen mobile terminal products, more and more terminal products use the fingerprint recognition technology under the screen. However, the fingerprint recognition under the screen of the existing terminal products relies on the uniform light spot emitted by the display panel for supplementary light, so that the fingerprint image generated on the optical sensor has uneven brightness and poor quality.

SUMMARY OF THE INVENTION

Embodiments of the present application provide an electronic device and a fingerprint image acquisition method.

On the one hand, an embodiment of the present application provides an electronic device, including a display panel and a light-emitting component, the display panel has a fingerprint identification area corresponding to an optical sensor, and the light-emitting component emits light in the fingerprint identification area to form a target light spot, the brightness of the first sub-edge region of the edge region of the target light spot is smaller than the brightness of the second sub-edge region of the edge region of the target light spot, wherein the first sub-edge region is the edge region along the edge region. The region in the polarization direction of the display panel, the second sub-edge region is the region where the edge region is located outside the first sub-edge region.

On the other hand, an embodiment of the present application also provides a method for acquiring a fingerprint image, the method comprising:

Get fingerprint image acquisition request;

Controlling the light-emitting component to form a target light spot in the fingerprint identification area, wherein the brightness of the first sub-edge area of the edge area of the target light spot is less than the brightness of the second sub-edge area of the edge area of the target light spot, wherein the first sub-edge area of the target light spot A sub-edge area is an area of the edge area along the polarization direction of the display panel, and the second sub-edge area is an area of the edge area outside the first sub-edge area;

The reflected light is acquired in the fingerprint identification area based on the target light spot, and a fingerprint image is generated according to the reflected light.

In the electronic device provided by the embodiments of the present application, a target light spot is formed by causing the light-emitting component to emit light in the fingerprint identification area, and the brightness of the first sub-edge area of the edge area of the target light spot is smaller than the brightness of the second sub-edge area of the edge area of the target light spot The brightness of the edge area, so that even if the light reflected to the optical sensor based on the second sub-edge area is weakened by the polarizer, the difference between the brightness of the first sub-edge area and the brightness of the first sub-edge area is smaller or even the same. The fingerprint image obtained by the target light spot is of high quality.

Description of drawings

1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application;

Fig. 2 is the schematic diagram of the target light spot on the fingerprint identification area of the electronic device shown in Fig. 1;

3 is a schematic diagram of an optical sensor of the electronic device shown in FIG. 1;

4 is a schematic diagram of a luminance distortion curve of a collimating mirror of the optical sensor of the electronic device shown in FIG. 1;

Fig. 5 is the schematic diagram of the brightness variation curve of the target light spot shown in Fig. 2 along the direction from the central area to the edge area;

FIG. 6 is a schematic diagram of a light-emitting assembly of the electronic device shown in FIG. 1;

FIG. 7 is a schematic diagram of the light-emitting assembly shown in FIG. 6 being further loaded with a third voltage;

FIG. 8 is a schematic flowchart of a method for acquiring a fingerprint image provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

The present application provides an electronic device. The electronic device has a fingerprint recognition function. Among them, electronic equipment refers to the equipment that is composed of electronic components such as integrated circuits, transistors, and electronic tubes, and uses electronic technology (including) software to play a role. Common electronic equipment includes: smart phones, tablet computers, notebook computers, PDAs, mobile Internet devices (mobile internet devices, MIDs), wearable devices, such as smart watches, smart bracelets, pedometers, etc.

1 and 2, the electronic device 100 includes a display panel 1 and a light-emitting component 2, the display panel 1 has a fingerprint recognition area 11 corresponding to the optical sensor 3, and the light-emitting component 2 is located in the fingerprint recognition area 11. Emit light to form a target light spot 111, and the brightness of the first sub-edge region 121 of the edge region 12 of the target light spot 111 is smaller than the brightness of the second sub-edge region 122 of the edge region 12 of the target light spot 111, wherein the The first sub-edge region 121 is the region of the edge region 12 along the polarization direction A of the display panel 1 , and the second sub-edge region 122 is the region where the edge region 12 is located outside the first sub-edge region 121 Area.

The target light spot 111 is formed by emitting light from the light-emitting component 2 in the fingerprint identification area 11 , and the brightness of the first sub-edge area 121 of the edge area 12 of the target light spot 111 is smaller than that of the second sub-edge area 12 of the target light spot 111 . The brightness of the edge region 122, so that even if the light reflected from the second sub-edge region 122 to the optical sensor 3 is weakened by the polarizer, the difference between the brightness of the first sub-edge region 121 and the brightness of the first sub-edge region 121 is smaller or even the same. The quality of the fingerprint image obtained by the electronic device 100 based on the target light spot 111 is higher.

Optionally, the display panel 1 may be a liquid crystal display panel 1 . Specifically, the display panel 1 is a display tool for displaying a certain electronic file on a screen through a specific transmission device and then reflecting it to the human eye. The display panel 1 includes a cover glass, a touch module, and a display module. Usually, two glass substrates are equipped with an alignment film, and the liquid crystal will be aligned along the groove. Since the alignment groove of the glass substrate is deviated by 90°, the molecules in the liquid crystal are aligned in the same plane like blinds. When the nematic transitions from one liquid level to another, it gradually twists by 90°, which means that the phases of the two layers of molecules are arranged 90° out of phase. The most commonly used liquid crystal type is nematic liquid crystal, and the molecular shape is slender rod-shaped. Under the action of different current and electric fields, the liquid crystal molecules will be arranged in a regular rotation of 90°, resulting in a difference in light transmittance. The difference between light and dark is generated under the action, and each pixel is controlled by this principle to form the desired image. Of course, in other embodiments, the display panel 1 may also be an organic light emitting diode display panel.

Optionally, the fingerprint identification area 11 may be the entire area on the display panel 1 , or may be a partial area of the display panel 1 . Further, the fingerprint identification area 11 is located in the display area 14 of the display panel 1 , and its area is smaller than that of the display area 14 . Specifically, the fingerprint identification area 11 can be understood as a corresponding area on the display panel 1 where fingerprint identification can be performed. Only when the finger of the target acquisition object is aligned with the fingerprint identification area 11 , the fingerprint image can be collected. Of course, in other embodiments, the fingerprint identification area 11 is the entire display area 14 of the display panel 1 . The electronic device 100 can realize full-screen fingerprint recognition.

It should be noted here that the finger of the target collection object can abut on the fingerprint recognition area 11 or be close to the fingerprint recognition area 11 , in other words, the finger of the target collection object does not touch the fingerprint recognition area 11 .

Optionally, the fingerprint identification area 11 may be circular, rectangular, or other shapes.

Optionally, the area of the fingerprint identification area 11 coincides with the area of the formed target light spot 111 . In other words, the light-emitting component 2 can make the entire fingerprint identification area 11 emit light. The target light spot 111 can be the identification light for fingerprint recognition, which will be reflected by the target acquisition object after hitting the finger of the target acquisition object, and then reach the optical sensor 3 through the display panel 1 , so that a fingerprint image is formed on the optical sensor 3 . Of course, in other embodiments, the area of the target light spot 111 may also be smaller than the area of the fingerprint identification area 11 .

It can be understood that since the fingerprint identification area 11 and the area of the target light spot 111 overlap, the first sub-edge area 121 of the target light spot 111 is the first sub-edge area 121 of the fingerprint identification area 11 and the second sub-edge area of the target light spot 111. 122 is the second sub-edge area 122 of the fingerprint identification area 11 .

Optionally, as shown in FIG. 2 , the target light spot 111 area is a circular area. The target light spot 111 has a central area 13 and an edge area 12 surrounding the central area 13 . Further, the central region 13 is completely surrounded by the edge regions 12 . Of course, in other embodiments, the target light spot 111 area may also be a rectangular area, a trapezoidal area, or the like. Of course, in other embodiments, the central area 13 may also be partially surrounded by the edge area 12 .

In the prior art, the light spot formed by the light emitted by the light emitting component 2 in the fingerprint identification area 11 is a uniform light spot. The uniform light spot can be understood as the light intensity at each position of the fingerprint identification area 11 being approximately the same. The uniform light spot is reflected on the optical sensor 3 by the interaction of the finger of the target acquisition object. During the light propagation process, the light not along the polarization direction A of the polarizer of the display panel 1 will be weakened by the polarizer. The brightness of the light entering the optical sensor 3 along the polarization direction A of the polarizer is lower than the brightness of the light entering the optical sensor 3 along the polarization direction A of the polarizer, so that the edge region 12 of the fingerprint image generated by the optical sensor 3 The light intensity is inconsistent, thereby reducing the image quality of the fingerprint image.

The brightness of the first sub-edge region 121 of the edge region 12 of the target light spot 111 of the electronic device 100 provided by the present application is smaller than the brightness of the second sub-edge region 122 of the edge region 12 of the target light spot 111 , wherein the first sub-edge region 122 The sub-edge region 121 is the region of the edge region 12 along the polarization direction A of the display panel 1 , and the second sub-edge region 122 is the region of the edge region 12 outside the first sub-edge region 121 , so that even if the light reflected from the second sub-edge region 122 to the optical sensor 3 is weakened by the polarizer, the difference between the brightness of the first sub-edge region 121 and the brightness of the first sub-edge region 121 is smaller or even the same, so that the electronic device 100 is based on The fingerprint image obtained by the target light spot 111 is of high quality.

It can be understood that, referring to FIG. 1 again, the electronic device 100 further includes an optical sensor 3, and the optical sensor 3 is disposed corresponding to the fingerprint identification area 11, and is used to collect the fingerprint image of the target collection object.

Specifically, the optical sensor 3 generally refers to a device capable of sensing light energy from ultraviolet light to infrared light and converting the light energy into electrical signals. The optical sensor 3 can be designed to be adjustable in block shape, circle shape, point shape, or other adjustment forms, so that it can be adaptively adjusted according to the actual light spot pattern fill light shape, which helps to make the optical sensor 3 adapt more complex. environment of use.

The light signal identified by the optical sensor 3 may be visible light or invisible light.

For example, the light signal is visible light, and a photoelectric effect occurs when the photosensitive layer of the optical sensor 3 senses the visible light. For example, the photosensitive layer of the optical sensor 3 can use silicon-rich compounds, including but not limited to silicon-rich silicon oxide (SiOx), silicon-rich silicon nitride (SiNy), silicon-rich silicon oxynitride (SiOxNy), etc., wherein x, y is a positive integer, such as x=2, y=2. The input end of the optical sensor 3200 is made of transparent conductive material. The transparent conductive material may be, but not limited to, indium tin oxide (ITO). The light signal enters the photosensitive layer of the optical sensor 3200 through the input end of the optical sensor 3 .

It can be understood that, referring to FIG. 1 again, the electronic device 100 further includes a controller 5 , the controller 5 is electrically connected to the light-emitting component 2 , and the controller 5 controls the light emitted by the light-emitting component 2 intensity, so that the brightness of the first sub-edge region 121 of the edge region 12 of the target light spot 111 is smaller than the brightness of the second sub-edge region 122 of the edge region 12 of the target light spot 111 .

3, since the brightness of the first sub-edge region 121 of the target light spot 111 is smaller than the brightness of the second sub-edge region 122 of the edge region 12 of the target light spot 111, when the target acquisition object is located in the In the fingerprint identification area 11, the target light spot 111 of the fingerprint identification area 11 is reflected by the target acquisition object to the optical sensor 3, and the optical sensor 3 corresponds to the photosensitive unit of the first sub-edge area 121, namely the first The difference between the luminance of the photosensitive unit group 31 and the luminance of the photosensitive unit of the optical sensor 3 corresponding to the second sub-edge, that is, the luminance of the second photosensitive unit group 32 is 0˜50. Optionally, when the target collection object is located in the fingerprint recognition area 11, the target light spot 111 of the fingerprint recognition area 11 is reflected by the target collection object to the optical sensor 3, and the optical sensor 3 corresponds to the The difference between the brightness of the photosensitive cells in the first sub-edge region 121 and the brightness of the photosensitive cells in the second sub-edge region 122 corresponding to the optical sensor 3 is zero. In other words, the brightness of the photosensitive cells of the optical sensor 3 corresponding to the first sub-edge region 121 is the same as the brightness of the photosensitive cells of the optical sensor 3 corresponding to the second sub-edge region 122 . Correspondingly, the light emission of the light emitting component 2 is controlled so that the brightness of the light emitted to the first sub-edge region 121 is smaller than the brightness of the light emitted to the second sub-edge region 122 . For example, if the brightness of the light in the non-polarization direction A reduced by the polarizer is 50 brightness, then the brightness of the light in the first sub-edge region 121 is 100 brightness, and the brightness of the light in the second sub-edge region 122 is is a brightness value of 150. In this way, when the target acquisition object interacts with the target light spot 111 and is incident on the optical sensor 3, the brightness of the photosensitive unit corresponding to the first sub-edge area 121 on the optical sensor 3 is a brightness value of 100, while the optical sensor 3 has a brightness value of 150. The brightness of the photosensitive units corresponding to the second sub-edge area 122 is a brightness value of 100, so that the first photosensitive unit group 31 and the second photosensitive unit group 32 on the optical sensor 3 have the same brightness.

The fingerprint recognition principle of this embodiment is as follows: when the target collection object needs to collect fingerprints, the finger of the target collection object is placed in the fingerprint recognition area 11, and the controller 5 controls the light-emitting component 2 to emit light with different light intensities corresponding to different areas to the fingerprint recognition area. 11. The target light spot 111 is formed so that the brightness of the first sub-edge region 121 of the target light spot 111 is smaller than the brightness of the second sub-edge region 122, and the target light spot 111 forms the light for identification, during which due to the ridges (raised parts of the finger prints) ) will be in direct contact with the fingerprint identification area 11, thereby destroying the propagation of the identification light in the waveguide, so that the light energy that finally reaches the optical sensor 3 is lost, and the valley (concave part) of the fingerprint will not be caused by not contacting the identification area. If the light intensity is lost, the light carrying the fingerprint ridge and valley information finally reaches the optical sensor 3. The optical sensor 3 judges the ridge and valley according to the intensity of the light energy in the receiving area. After image processing, a clear fingerprint image is generated to realize fingerprint recognition.

Wherein, since the brightness of the first sub-edge region 121 of the target light spot 111 is smaller than the brightness of the second sub-edge region 122 of the edge region 12 of the target light spot 111, when the target acquisition object is located in the fingerprint identification region 11, the The target light spot 111 of the fingerprint identification area 11 is reflected by the target acquisition object to the optical sensor 3, and the optical sensor 3 corresponds to the light-sensitive unit of the first sub-edge area 121, that is, the brightness of the first light-sensitive unit group 31 and all The difference in brightness between the photosensitive units of the optical sensor 3 corresponding to the second sub-edge area 122 , that is, the second photosensitive unit group 32 is small and close to zero, so that the fingerprint image generated by the optical sensor 3 corresponds to the first sub-edge area 121 and the second sub-edge region 122 are preferred.

Further, please refer to FIG. 1 again, the target light spot 111 also has a central area 13 , the edge area 12 surrounds the central area 13 , and the target light spot 111 is along the center area 13 to the edge area 12 . The brightness in the direction gradually decreases. When the target acquisition object is located in the fingerprint recognition area 11, the target light spot 111 in the fingerprint recognition area 11 is reflected by the target acquisition object to the optical sensor 3, and the optical sensor 3. The difference between the brightness collected by the central area 13 and the brightness collected by the optical sensor 3 corresponding to the edge area 12 is 0-50.

It can be understood that please refer to FIG. 4 and FIG. 5 together. FIG. 4 is the brightness distortion curve of the collimating lens of the optical sensor 3 , and FIG. 5 is the brightness change curve of the target light spot 11 along the direction from the center area to the edge area. The change of the brightness variation curve of the target light spot 111 along the direction from the central region 13 to the edge region 12 is opposite to the change of the brightness distortion curve of the collimating mirror of the optical sensor 3 .

By making the brightness change curve of the target light spot 111 opposite to the change of the brightness distortion curve of the collimating lens, the brightness changes of the edge area 12 and the center area 13 on the optical sensor 3 are made smaller, so that the fingerprint image is formed corresponding to the center area 13 and the edge area. The background brightness of the area 12 is more uniform, and the signal-to-noise ratio of the fingerprint image corresponding to the edge area 12 is improved.

Specifically, the optical sensor 3 includes a photosensitive unit and a collimating mirror. The collimating mirror is used to focus the light entering the photosensitive unit from the display panel 1 and then transmit it to the photosensitive unit. The focusing degree of the collimating mirror corresponding to the central area 13 is greater than that of the collimating mirror corresponding to the edge area 12. . If the target light spot 111 is a uniform light spot, due to the influence of the optical performance of the collimating lens, the part corresponding to the central area 13 in the fingerprint image obtained by the optical sensor 3 will be brighter, while the part corresponding to the edge area 12 will be darker. As a result, the part corresponding to the edge region 12 in the fingerprint image obtained by the optical sensor 3 is relatively blurred, and the image quality is poor.

In this embodiment, the change of the brightness change curve of the target light spot 111 along the direction from the center area 13 to the edge area 12 is opposite to the change of the brightness distortion curve of the collimator lens of the optical sensor 3, so that the fingerprint image obtained by the optical sensor 3 The difference between the brightness of the part corresponding to the central area 13 and the part corresponding to the edge area 12 is close to zero, so that the brightness of the background in the fingerprint image obtained by the optical sensor 3 is uniform and the quality of the fingerprint image is improved.

For example, the brightness of the center of the central area 13 is controlled at a brightness value of 100, the brightness of the first sub-edge area 121 is controlled at a brightness value of 150, the brightness of the second sub-edge area 122 is controlled at a brightness value of 200, and the center of the central area 13 is controlled at a brightness value of 150. Since the brightness of the edge area 12 gradually decreases, the fingerprint image obtained by the optical sensor 3 based on the target light spot 111 corresponds to the brightness value of the central area 13 equal to 100 brightness value, or close to 100 brightness value, and the fingerprint image corresponds to the brightness of the first sub-edge area 121 The brightness value of 100 may be affected by the collimating lens, and the brightness of the fingerprint image corresponding to the second sub-edge region 122 may be affected by the collimating lens and the polarizer may be the brightness value of 100. The brightness of each area of the fingerprint image obtained by the optical sensor 3 based on the target light spot 111 is approximately the same, in other words, the brightness of the background of the fingerprint image is relatively uniform, which improves the quality of the fingerprint image. The luminance values of the above-mentioned regions are only used as examples to facilitate understanding.

The electronic device 100 provided by the embodiment of the present application further makes the change of the brightness change curve from the center of the center area 13 of the target light spot 111 to the edge area 12 complementary to the change of the brightness distortion curve of the collimator, so that the optical sensor 3 is based on the target Parts of the fingerprint image obtained by the light spot 111 corresponding to the central area 13 and the edge area 12 have uniform brightness, which further improves the quality of the fingerprint image and thus improves the sensitivity during fingerprint identification.

Further, please refer to FIG. 3 again, the optical sensor 3 has a first photosensitive unit group 31 aligned with the first sub-edge area 121 and a second photosensitive unit group 32 aligned with the second sub-edge area 122, so The controller 5 is further configured to control the photosensitive performance of the second photosensitive unit group 32 to be better than that of the first photosensitive unit group 31 .

Specifically, the photosensitive performance of the second photosensitive unit group 32 is better than the performance parameters of the first photosensitive unit group 31 means that the comprehensive performance parameters of the second photosensitive unit group 32 are better than the comprehensive performance parameters of the first photosensitive unit group 31 . In other words, the performance parameters of some photosensitive units in the second photosensitive unit group 32 may be worse than those of some photosensitive units in the first photosensitive unit group 31 , but the overall parameters of the second photosensitive unit group 32 are better than those of the first photosensitive unit group 31 . better. The performance parameters are expressed as the gain of the photosensitive unit, the exposure time of the photosensitive unit, the arrangement density of the photosensitive unit, the sensitivity of the photosensitive unit, and so on. In this embodiment, the photosensitive performance of the second photosensitive unit group 32 is better than the performance parameters of the first photosensitive unit group 31 , so that the part of the fingerprint image collected by the optical sensor 3 corresponding to the first sub-edge region 121 and the part corresponding to the second sub-edge region 121 are The difference of the sharpness of the part of the sub-edge area 122 is smaller than the preset difference, wherein the preset difference is equal to the photosensitive performance of the second photosensitive unit group 32 is equal to the performance parameter of the first photosensitive unit group 31, and the fingerprint image corresponds to the first sub-edge The difference in sharpness between the portion of the region 121 and the portion corresponding to the second sub-edge region 122 .

Optionally, the controller 5 is further configured to control the gain of the photosensitive units in the second photosensitive unit group 32 to be greater than the gain of the photosensitive units in the first photosensitive unit group 31 . The photosensitive performance is determined by at least the gain of the photosensitive unit, and the photosensitive performance is proportional to the gain. The controller 5 is used to control the gain of the second photosensitive unit group 32 to be greater than the gain of the first photosensitive unit group 31 . Among them, "gain" refers to the magnification. When specifically designing the gain parameters of each photosensitive unit on the optical sensor 3, first calibrate and obtain a plane image without fingerprints, then obtain the brightness parameter of each photosensitive unit corresponding to the image, and then control the photosensitive units at different positions through the controller 5. Gain, adjust the gain parameters of all photosensitive units to be consistent, so that all photosensitive units are in the initialization state. Next, acquire a plane image without fingerprints again, record the image and the gain parameters of each photosensitive unit, and use the image and the gain parameters of each photosensitive unit as calibration parameters of the subsequently collected fingerprint image. By collecting the brightness parameters of each photosensitive unit corresponding to the fingerprint-free image, the gain parameters of all photosensitive units are adjusted to be consistent, so that all photosensitive units are in the initialization state, which is used as a reference for adjustment in turn, which is convenient for the subsequent gain of photosensitive units. Adjusting the parameters can ensure that the gain parameters of the photosensitive units at different positions meet the needs of users, and help to improve the clarity of the collected fingerprint image aligned with the second edge area 12, thereby helping to improve the sensitivity of fingerprint recognition. .

Further, please refer to FIG. 3 again, the optical sensor 3 also has a third photosensitive unit group 33 aligned with the central area 13 , and the controller 5 is also used to control the second photosensitive unit group 32 and the first photosensitive unit group 33 The photosensitive performance of the unit group 31 is better than that of the third photosensitive unit group 33 .

In this embodiment, the photosensitive performance of the third photosensitive unit group 33 is better than the performance parameters of the first photosensitive unit group 31 , so that the part of the fingerprint image collected by the optical sensor 3 corresponding to the first sub-edge region 121 and the part corresponding to the second sub-edge region 121 are The difference in the sharpness of the part of the sub-edge area 122 is smaller than the preset difference, wherein the preset difference is equal to the photosensitive performance of the third photosensitive unit group 33 equal to the performance parameters of the first photosensitive unit group 31 and the second photosensitive unit group 32, and the fingerprint The difference in sharpness between the portion corresponding to the edge region 12 and the portion corresponding to the central region 13 in the image.

Further, please refer to FIG. 6 , the light-emitting component 2 may be formed by the light-emitting layer 18 of the display panel 1 . The display panel 1 includes an anode layer 17 , a light-emitting layer 18 and a cathode layer 19 that are stacked in sequence, the light-emitting layer 18 forms the light-emitting component 2 , and the anode layer 17 and the cathode layer 19 are loaded with Drive voltage to make the light-emitting layer 18 emit light, the controller 5 controls the light-emitting layer 18 corresponding to the first sub-edge region 121 to be loaded with the first voltage U1, and controls the light-emitting layer corresponding to the second sub-edge region 122 The layer 18 is loaded with a second voltage U2, wherein the voltage value of the first voltage U1 is smaller than the voltage value of the second voltage U2. The greater the driving voltage applied to the light-emitting layer 18, the greater the brightness emitted by the light-emitting layer 18. Of course, in other embodiments, the light emitting assembly 2 may also be a light source device disposed outside the display panel 1 .

Specifically, the fingerprint identification area 11, that is, the light-emitting layers 18 corresponding to different areas of the target light spot 111 are controlled by independent driving voltages. When the voltage value of U2 is lower than the voltage value of the second voltage U2 recorded in the light-emitting layer 18 corresponding to the second sub-edge region 122 of the target spot 111 region, under the condition that other conditions are the same, the light-emitting layer corresponding to the first sub-edge region 121 The light-emitting brightness of 18 is lower than that of the light-emitting layer 18 corresponding to the second sub-edge region 122 , which helps to improve the clarity of the collected fingerprint image, thereby improving the sensitivity of fingerprint identification.

7 , the controller 5 also controls the light-emitting layer 18 corresponding to the central region 13 to be loaded with a third voltage U3 , and the voltage value of the third voltage U3 is smaller than the first voltage U1 voltage value. When the voltage value of the third voltage U3 loaded on the light-emitting layer 18 corresponding to the central area 13 of the target spot 111 area is lower than the voltage value of the first voltage U1 recorded on the light-emitting layer 18 corresponding to the first sub-edge area 121 of the target spot 111 area , under the condition that other conditions are the same, the luminous brightness of the light-emitting layer 18 corresponding to the central area 13 is less than that of the light-emitting layer 18 corresponding to the edge area 12, which helps to improve the clarity of the collected fingerprint image, thereby improving the fingerprint image. Sensitivity of recognition.

By forming the light-emitting component 2 in the light-emitting layer 18 of the display panel 1 , it is beneficial to control the different brightness of each region of the light-emitting layer 18 , thereby improving the reliability of the electronic device 100 in use.

In an optional embodiment, the light-emitting layer 18 is provided with red sub-pixels, green sub-pixels and blue sub-pixels. When the optical sensor 3 collects the fingerprint image of the target collection object, the controller 5 also uses The red sub-pixels at the portion where the light-emitting layer 18 is aligned with the first sub-edge region 121 and/or the portion where the light-emitting layer 18 is aligned with the second sub-edge region 122 do not emit light.

Specifically, setting the green sub-pixels in the fingerprint identification area 11, that is, the corresponding parts of the target light spot 111, can make the background noise of the display panel 1 and the collected fingerprint image more balanced, while the blue sub-pixels can make the collected fingerprint image contrast. It is more obvious. Therefore, the green sub-pixels and the blue sub-pixels are arranged at intervals to improve the contrast of the collected fingerprint image, further improve the quality of the collected fingerprint image, and help to improve the recognition accuracy of the optical fingerprint.

In one embodiment, the size of the light-emitting area of the green sub-pixel and the blue sub-pixel is the same. At this time, the collected fingerprint image can be made to have lower noise and higher contrast, so that the collected fingerprint image is more coordinated, which is more helpful to improve the recognition accuracy of the optical fingerprint.

Please refer to FIG. 8 together. FIG. 8 is a schematic flowchart of a method for acquiring a fingerprint image provided by an embodiment of the present application. The method for acquiring a fingerprint image includes:

110: Obtain a fingerprint image acquisition request.

Specifically, when the finger of the target acquisition object is placed in the fingerprint identification area 11, the electronic device 100 generates a fingerprint image acquisition request.

120: Control the light-emitting component 2 to form a target light spot 111 in the fingerprint identification area 11, wherein the brightness of the first sub-edge area 121 of the edge area 12 of the target light spot 111 is smaller than the brightness of the second sub-edge area 12 of the target light spot 111 The brightness of the edge region 122 , wherein the first sub-edge region 121 is the region of the edge region 12 along the polarization direction A of the display panel 1 , and the second sub-edge region 122 is the edge region 12 The region is located outside the first sub-edge region 121 .

Specifically, for the specific structure of the light-emitting component 2, reference may be made to the structure of the light-emitting component 2 in the electronic device 100 mentioned in the foregoing embodiments, which will not be repeated here.

It can be understood that the light-emitting component 2 emits light in the fingerprint identification area 11 to form a light spot with uniform brightness; the optical sensor 3 obtains the reflected light corresponding to the light spot in the fingerprint identification area 11; The initial fingerprint image corresponding to the reflected light, the first brightness value, the second brightness value and the center brightness value are obtained in the initial fingerprint image, and the first brightness value is aligned with the first sub-edge of the initial fingerprint image The brightness value of the region 121, the second brightness value is the brightness value of the initial fingerprint image aligned with the second sub-edge region 122, the central brightness value of the initial fingerprint image aligned with the central region 13 According to the proportional relationship between the first brightness value, the second brightness value and the center brightness value, the light-emitting component 2 is controlled to adjust the light-emitting brightness, and the adjusted light-emitting component 2 is used for fingerprint identification. The area 11 emits light to form the target light spot 111 .

Specifically, the controller 5 controls the light-emitting component 2 to emit light with uniform brightness toward the fingerprint identification area 11 to form a uniform light spot. The fingerprint image acquired by the optical sensor 3 based on the uniform light spot is defined as the initial fingerprint image. The controller 5 obtains the brightness values of the center area 13, the first sub-edge area 121 and the second sub-edge area 122 of the initial fingerprint image alignment spot, respectively, corresponding to the center brightness value, the first brightness value and the second brightness value, The difference between the obtained first luminance value and the luminance value of the first sub-edge area 121 of the uniform spot is the first difference, and the difference between the obtained second luminance value and the luminance value of the second sub-edge area 122 of the uniform spot is the first difference. Two difference values, adjust the luminous intensity of each area of the light-emitting component 2 according to the first difference value and the second difference value, and the light-emitting component 2 emits light toward the fingerprint identification area 11 based on the adjusted luminous intensity to form a target light spot 111, wherein all the The brightness of the first sub-edge region 121 of the edge region 12 of the target light spot 111 is smaller than the brightness of the second sub-edge region 122 of the edge region 12 of the target light spot 111 .

Further, the target light spot 111 also has a central area 13 , the edge area 12 surrounds the central area 13 , and the brightness of the target light spot 111 gradually decreases along the direction from the central area 13 to the edge area 12 . . For the method of adjusting the brightness of the target light spot 111 along the direction from the center region 13 to the edge region 12 , reference may be made to the method for adjusting the brightness of the first sub-edge region 121 and the second sub-edge region 122 , which will not be repeated here.

130: Acquire reflected light in the fingerprint identification area 11 based on the target light spot 111, and generate a fingerprint image according to the reflected light.

Specifically, the brightness difference between the part of the fingerprint image obtained by the light sensor based on the target light spot 111 corresponding to the first sub-edge region 121 and the part corresponding to the second sub-edge region 122 is close to zero, so that the optical sensor 3 obtains the brightness difference. The brightness of the background in the fingerprint image is uniform, which improves the quality of the fingerprint image.

Further, the difference between the brightness of the part of the fingerprint image obtained by the optical sensor 3 corresponding to the central area 13 and the brightness of the part corresponding to the edge area 12 is close to zero, so that the brightness of the background in the fingerprint image obtained by the optical sensor 3 is uniform, Improved fingerprint image quality.

The image acquisition method provided by the embodiment of the present application forms a target spot 111 by emitting light in the fingerprint identification area 11 , and the brightness of the first sub-edge area 121 of the edge area 12 of the target spot 111 is smaller than that of the edge area of the target spot 111 The brightness of the second sub-edge region 122 of The brightness of the target light spot 111 is the same, so that the quality of the fingerprint image obtained by the electronic device 100 based on the target light spot 111 is higher.

The above is the implementation of the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the embodiments of the present application, several improvements and modifications can also be made. These improvements and modifications are also It is regarded as the protection scope of this application.

Claims (11)

1. An electronic device is characterized by comprising a display panel and a light-emitting component, wherein the display panel is provided with a fingerprint identification area corresponding to an optical sensor, the light-emitting component emits light in the fingerprint identification area to form a target light spot, the brightness of a first sub-edge area of an edge area of the target light spot is smaller than that of a second sub-edge area of the target light spot, the first sub-edge area is an area of the edge area along the polarization direction of the display panel, and the second sub-edge area is an area of the edge area outside the first sub-edge area;

wherein, the electronic equipment still includes the controller, the controller electricity is connected in the light emitting component, the target facula still has the central zone, the light emitting component is at the fingerprint identification district emission light forms the target facula, include: the light-emitting component emits light in a fingerprint identification area to form light spots with uniform brightness, the optical sensor acquires reflected light corresponding to the light spots in the fingerprint identification area, the optical sensor generates an initial fingerprint image corresponding to the reflected light, the controller acquires a first brightness value, a second brightness value and a central brightness value in the initial fingerprint image, the first brightness value is a brightness value of the initial fingerprint image aligned with the first sub-edge area, the second brightness value is a brightness value of the initial fingerprint image aligned with the second sub-edge area, the central brightness value is a brightness value of the initial fingerprint image aligned with the center of the central area, and the controller controls the light-emitting component to adjust the light-emitting brightness according to a proportional relation among the first brightness value, the second brightness value and the central brightness value, and emitting light rays in the fingerprint identification area through the adjusted light emitting assembly to form the target light spot.

2. The electronic device of claim 1, further comprising an optical sensor disposed corresponding to the fingerprint identification area for capturing a fingerprint image of a target capture object, wherein when the target capture object is located in the fingerprint identification area, a target light spot of the fingerprint identification area is reflected to the optical sensor by the target capture object, and a difference between a brightness of the light sensing unit corresponding to the first sub-edge area of the optical sensor and a brightness of the light sensing unit corresponding to the second sub-edge area of the optical sensor is 0-50.

3. The electronic device of claim 2, wherein the edge region surrounds the central region, the brightness of the target light spot gradually increases along a direction from the central region to the edge region, when the target capture object is located in the fingerprint identification region, the target light spot of the fingerprint identification region is reflected to the optical sensor by the target capture object, and a difference between the brightness captured by the optical sensor corresponding to the central region and the brightness captured by the optical sensor corresponding to the edge region is 0-50.

4. The electronic device of claim 3, wherein a change in a luminance variation curve of the target spot along a direction from the central region to the edge region is opposite to a change in a luminance distortion curve of a collimating mirror of the optical sensor.

5. The electronic device of claim 2, wherein the controller controls the intensity of the light emitted from the light emitting assembly so that the brightness of a first sub-edge region of the target spot is less than the brightness of a second sub-edge region of the target spot.

6. The electronic device according to claim 5, wherein the display panel includes an anode layer, a light emitting layer, and a cathode layer sequentially stacked, the light emitting layer forms the light emitting assembly, a driving voltage is applied between the anode layer and the cathode layer to cause the light emitting layer to emit light, and the controller controls the light emitting layer corresponding to the first sub-edge region to be applied with a first voltage and controls the light emitting layer corresponding to the second sub-edge region to be applied with a second voltage, wherein a voltage value of the first voltage is smaller than a voltage value of the second voltage.

7. The electronic device of claim 6, wherein the light emitting layer is provided with a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the controller is further configured to control the red sub-pixel of the portion of the light emitting layer aligned with the first sub-edge region and/or the portion of the light emitting layer aligned with the second sub-edge region not to emit light when the optical sensor captures a fingerprint image of a target capture object.

8. The electronic device of claim 2, wherein the optical sensor has a first photosensitive cell group aligned with the first sub-edge region and a second photosensitive cell group aligned with the second sub-edge region, and the controller is further configured to control a photosensitive performance of the second photosensitive cell group to be better than a photosensitive performance of the first photosensitive cell group.

9. The electronic device of claim 8, wherein the controller is further configured to control a gain of photosites in the second set of photosites to be greater than a gain of photosites in the first set of photosites.

10. A fingerprint image acquisition method, characterized in that the method comprises:

acquiring a fingerprint image acquisition request;

controlling a light-emitting component to form a target light spot in a fingerprint identification area, wherein the brightness of a first sub-edge area of an edge area of the target light spot is smaller than the brightness of a second sub-edge area of the target light spot, the first sub-edge area is an area of the edge area along the polarization direction of a display panel, and the second sub-edge area is an area of the edge area outside the first sub-edge area;

acquiring reflected light rays in the fingerprint identification area based on the target light spots, and generating a fingerprint image according to the reflected light rays;

wherein the target light spot further has a central area, and the controlling the light emitting component to form the target light spot in the fingerprint identification area comprises:

light is emitted in the fingerprint identification area through the light emitting assembly to form light spots with uniform brightness;

acquiring reflected light corresponding to the light spots in the fingerprint identification area through an optical sensor;

generating an initial fingerprint image corresponding to the reflected light through the optical sensor, and acquiring a first brightness value, a second brightness value and a central brightness value in the initial fingerprint image, where the first brightness value is a brightness value of the initial fingerprint image aligned with the first sub-edge region, the second brightness value is a brightness value of the initial fingerprint image aligned with the second sub-edge region, and the central brightness value is a brightness value of the initial fingerprint image aligned with the center of the central region;

and controlling the light-emitting component to adjust the brightness according to the proportional relation among the first brightness value, the second brightness value and the central brightness value, and emitting light rays in the fingerprint identification area through the adjusted light-emitting component to form the target light spot.

11. The fingerprint image obtaining method according to claim 10, wherein the edge area surrounds the central area, and the brightness of the target light spot gradually increases along a direction from the central area to the edge area.

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