Under-screen biometric feature acquisition system and method

Abstract

The application provides an under-screen biometric feature acquisition system and method, a control unit is used for determining a target light-emitting unit from a plurality of light-emitting units when a touch signal of a user touching a display screen is received, and controlling the target light-emitting unit to emit light rays at a preset light-emitting angle; wherein if a position irradiated by the light rays does not exist a biometric feature, the light rays are totally reflected in the display screen; if the position irradiated by the light rays exists the biometric feature, the light rays illuminate a user body part of the user touching the display screen; and a picture acquisition unit is used for receiving reflected light rays of the user body part to obtain a corresponding biometric feature image. The system can acquire the biometric feature image through the independent control unit, the picture acquisition unit and the light-emitting unit, does not need to arrange a light-emitting device in the display screen, thereby the acquisition time length can be reduced, the screen loss of the display screen is reduced, and when the position irradiated by the light rays does not exist the biometric feature, the mode that the light rays are totally reflected in the display screen can improve the effect of the acquired biometric feature image.

Description

Technical Field

[0001] This invention relates to the field of biometric acquisition technology, and in particular to an under-screen biometric acquisition system and method. Background Technology

[0002] In-display fingerprint collection refers to the process where, when a finger is placed on the display screen, an internal light source shines light onto the finger. The light signal formed by the reflection or transmission of this light on the finger is collected, and this light signal carries the fingerprint information, thus enabling in-display fingerprint collection. Taking mobile phones as an example, in related technologies, when using a large-area display screen for fingerprint collection, the common method is to have an array of light-emitting devices arranged within the large-area display screen. When a finger touches the display screen, the phone's control unit needs to scan all the light-emitting devices arranged within the display screen, identify the light-emitting devices that need to emit light, and then send an illumination command to the light-emitting devices that need to emit light, and send an inactivation command to the light-emitting devices that do not need to emit light. This method has a long collection time, and this method, which requires the display screen itself to emit light, increases screen wear and tear, and the quality of the fingerprint image obtained is also poor. Summary of the Invention

[0003] The purpose of this invention is to provide an under-screen biometric acquisition system and method to reduce acquisition time, reduce screen wear, and improve the quality of acquired biometric images.

[0004] This invention provides an under-display biometric data acquisition system, comprising: a display screen, a control unit, an image acquisition unit, and multiple light-emitting units surrounding the image acquisition unit; wherein the image acquisition unit and each light-emitting unit are disposed below the display screen; each light-emitting unit is communicatively connected to the control unit; the control unit is used to determine a target light-emitting unit from the multiple light-emitting units when it receives a touch signal from a user touching the display screen, and control the target light-emitting unit to emit light at a preset emission angle toward the touch position on the display screen; wherein, if there is no biometric feature at the illuminated position, the light is totally reflected within the display screen; if there is a biometric feature at the illuminated position, the light illuminates the user's body part touching the display screen; the image acquisition unit is used to receive the reflected light from the user's body part to obtain a biometric image of the user's body part.

[0005] Furthermore, the preset light emission angle is 45 degrees.

[0006] Furthermore, the control unit is also used to calculate the distance between the center point of the touch area corresponding to the user's body part on the touch screen and each light-emitting unit when a touch signal is received from the user's touch screen, and to determine the light-emitting unit corresponding to the smallest distance value as the target light-emitting unit.

[0007] Furthermore, the control unit is also used to select one light-emitting unit from the at least two light-emitting units as the target light-emitting unit if the minimum distance value corresponds to at least two light-emitting units.

[0008] Furthermore, the control unit is also used to calculate the area width of the touch area corresponding to the user's body part on the touch screen, determine the sub-light-emitting unit corresponding to the area width from the target light-emitting unit, and control the sub-light-emitting unit to emit light to the touch position on the screen at a preset light-emitting angle.

[0009] Furthermore, there is an air gap between the image acquisition unit and the display screen.

[0010] Furthermore, each light-emitting unit is attached to the display screen.

[0011] Furthermore, each light-emitting unit is attached to the image-collecting unit.

[0012] Furthermore, if the user's body part is their finger, the biometric image of that body part is a fingerprint image.

[0013] This invention provides an under-display biometric data acquisition method, comprising: when a control unit receives a touch signal from a user touching the display screen, determining a target light-emitting unit from a plurality of light-emitting units, and controlling the target light-emitting unit to emit light at a preset light-emitting angle toward the touch position on the display screen; wherein, if there is no biometric feature at the position illuminated by the light, the light is totally reflected within the display screen; if there is a biometric feature at the position illuminated by the light, the light illuminates the user's body part on the touch screen; and an image acquisition unit receives the reflected light from the user's body part to obtain a biometric image of the user's body part.

[0014] This invention provides an under-display biometric data acquisition system and method. The system includes a display screen, a control unit, an image acquisition unit, and multiple light-emitting units surrounding the image acquisition unit. The image acquisition unit and each light-emitting unit are positioned below the display screen. Each light-emitting unit is communicatively connected to the control unit. When the control unit receives a touch signal from a user touching the display screen, it determines a target light-emitting unit from among the multiple light-emitting units and controls the target light-emitting unit to emit light at a preset emission angle towards the touch location on the display screen. If no biometric feature is present at the illuminated location, the light undergoes total internal reflection within the display screen. If a biometric feature is present at the illuminated location, the light illuminates the user's body part touching the display screen. The image acquisition unit receives the reflected light from the user's body part to obtain a biometric image of the user's body part. In this system, when the control unit receives a touch signal, it can control the target light-emitting unit to emit light; after the image acquisition unit receives the reflected light from the user's body parts, it obtains the corresponding biometric image; the system can acquire biometric images through independent control unit, image acquisition unit and light-emitting unit, without the need to lay out light-emitting devices in the display screen, thereby reducing the acquisition time and reducing screen wear, and when there are no biometric features at the location of the light, the total internal reflection of the light in the display screen can improve the effect of the acquired biometric image. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 A schematic diagram of fingerprint acquisition provided in an embodiment of the present invention;

[0017] Figure 2 This is another fingerprint acquisition schematic diagram provided in an embodiment of the present invention;

[0018] Figure 3 This is another fingerprint acquisition schematic diagram provided in an embodiment of the present invention;

[0019] Figure 4 This is a top view of an under-screen biometric acquisition system provided in an embodiment of the present invention;

[0020] Figure 5 This is a front view of an under-screen biometric acquisition system provided in an embodiment of the present invention;

[0021] Figure 6This is a front view of another under-screen biometric acquisition system provided in an embodiment of the present invention;

[0022] Figure 7 This is a front view of another under-screen biometric acquisition system provided in an embodiment of the present invention;

[0023] Figure 8 This is a front view of another under-screen biometric acquisition system provided in an embodiment of the present invention;

[0024] Figure 9 This is a top view of another under-screen biometric acquisition system provided in an embodiment of the present invention;

[0025] Figure 10 This is a top view of another under-screen biometric acquisition system provided in an embodiment of the present invention;

[0026] Figure 11 This is a top view of another under-screen biometric acquisition system provided in an embodiment of the present invention;

[0027] Figure 12 This is a top view of another under-screen biometric acquisition system provided in an embodiment of the present invention. Detailed Implementation

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Currently, most phones with under-display optical fingerprint sensors capture fingerprint images at fixed points, so the logo prompts are always in fixed positions, such as... Figure 1 The diagram shown illustrates a fingerprint acquisition method where a fixed acquisition point is located on the phone screen, allowing fingerprints to be acquired at that point; specifically, as shown... Figure 2 Another fingerprint acquisition diagram is shown. During image acquisition, the screen emits a light upward at the fixed acquisition point to illuminate the finger. The reflected light from the finger passes downward through the screen and enters the image acquisition device, thereby obtaining a fingerprint image.

[0030] like Figure 3The diagram shows another fingerprint acquisition method, corresponding to large-area under-display optical fingerprint acquisition. This method allows for acquisition over a large area of ​​the screen, even the entire screen, rather than being fixed at a single point. The large display screen contains an array of light-emitting devices. When a finger touches the screen, the phone's control module scans all the light-emitting devices to identify those that need to emit light. It then sends a light-emitting command to the devices that need to emit light and a de-illuminate command to the devices that don't. This method is time-consuming, and the reliance on the display screen itself for light emission increases screen wear and results in poor fingerprint image quality. Currently, no effective solution has been proposed for providing illumination to the finger during large-area under-display optical fingerprint acquisition.

[0031] Based on this, embodiments of the present invention provide an under-screen biometrics acquisition system and method, which can be applied to various under-screen biometrics acquisition scenarios.

[0032] To facilitate understanding of this embodiment, a detailed description of an under-display biometric data acquisition system disclosed in this invention will be provided first. The system includes: a display screen, a control unit, an image acquisition unit, and multiple light-emitting units surrounding the image acquisition unit. The image acquisition unit and each light-emitting unit are disposed below the display screen. Each light-emitting unit is communicatively connected to the control unit.

[0033] The control unit is used to determine the target light-emitting unit from multiple light-emitting units when it receives a touch signal from the user's touch screen, and control the target light-emitting unit to emit light to the touch position on the screen at a preset light emission angle; wherein, if there are no biometric features at the position illuminated by the light, the light is totally reflected in the screen; if there are biometric features at the position illuminated by the light, the light illuminates the user's body part on the touch screen; the image acquisition unit is used to receive the reflected light from the user's body part and obtain a biometric image of the user's body part.

[0034] The aforementioned display screen can be a mobile phone display screen, a tablet computer display screen, etc., and is typically a capacitive display screen; the number of the aforementioned light-emitting units can be set according to actual needs; each light-emitting unit can be an array composed of multiple light-emitting devices, and each light-emitting unit is typically attached to the side of the image acquisition unit and can emit light independently; for example... Figure 4 The figure shows a top view of an under-screen biometric acquisition system. The top view of the acquisition unit 40 is rectangular. There are four light-emitting units, namely light-emitting units 41a, 41b, 41c and 41d. The four light-emitting units are respectively attached to the four sides of the acquisition unit 40.

[0035] like Figure 5The diagram shows a front view of an under-display biometric data acquisition system. The image acquisition unit 40 and each light-emitting unit are positioned below the display screen 42. The user's body part can be any finger or palm, for example, a finger touching the display screen. In practice, when a user touches the display screen 42, a touch signal is generated. Upon receiving this touch signal, the control unit identifies a target light-emitting unit from among multiple light-emitting units and controls that unit to emit light. During illumination, the target light-emitting unit typically emits light at a preset angle, such as emitting light at a 45-degree angle, directed towards the touch location on the display screen 42. A portion of the emitted light may reach the display screen 42. For fingerprint sensors, a portion of the light does not reach the fingerprint sensor. Total internal reflection can be used to capture this portion of the light. Specifically, the light that does not reach the fingerprint sensor is typically reflected within the screen of the display 42. The image acquisition unit 40 does not receive this portion of light. Through total internal reflection, this portion of light is prevented from entering the image acquisition unit 40, thus avoiding interference with the effective light received by the image acquisition unit 40, resulting in a stronger fingerprint signal and better suitability for large-area under-display optical fingerprint sensors. For the light that does reach the fingerprint sensor, the light passes through the display 42 to illuminate the finger. The reflected light from the finger then passes through the display 42 and enters the image acquisition unit 40. After receiving the reflected light, the image acquisition unit 40 generates the fingerprint image corresponding to that finger.

[0036] The aforementioned under-display biometric data acquisition system includes: a display screen, a control unit, an image acquisition unit, and multiple light-emitting units surrounding the image acquisition unit. The image acquisition unit and each light-emitting unit are located below the display screen. Each light-emitting unit is communicatively connected to the control unit. When the control unit receives a touch signal from a user touching the display screen, it identifies a target light-emitting unit from among the multiple light-emitting units and controls the target light-emitting unit to emit light at a preset emission angle towards the touch location on the display screen. If no biometric feature is present at the illuminated location, the light undergoes total internal reflection within the display screen. If a biometric feature is present at the illuminated location, the light illuminates the user's body part touched on the display screen. The image acquisition unit receives the reflected light from the user's body part to obtain a biometric image of that body part. In this system, when the control unit receives a touch signal, it can control the target light-emitting unit to emit light. After receiving the reflected light from the user's body part, the image acquisition unit obtains the corresponding biometric image. This system can acquire biometric images through independent control units, image acquisition units, and light-emitting units, eliminating the need for light-emitting devices within the display screen. This reduces acquisition time and screen wear. Furthermore, the total internal reflection of light within the display screen when no biometric feature is present improves the quality of the acquired biometric images.

[0037] Furthermore, the preset light-emitting angle is 45 degrees. For ease of explanation, let's take a user's finger touching the display screen as an example. Figure 6 The front view of another under-display biometric acquisition system shown illustrates that the light-emitting unit 40 does not emit light when the finger is not touching the display screen 42; as shown... Figure 7 The diagram shows a front view of another under-display biometric acquisition system. When a finger touches the display screen 42, to ensure total internal reflection of the light within the display screen 42 when there are no biometric features at the illuminated location, the target light-emitting unit (shaded area in the diagram) is typically controlled to emit light at a 45-degree upward angle. Figure 8 The front view of another under-display biometric acquisition system shown indicates that in areas without fingerprints, 45-degree light will be totally reflected within the screen, and the image acquisition unit 40 will not receive the light; in areas with fingerprints, light will pass through the display screen 42 to illuminate the finger, and the reflected light from the finger will then pass through the display screen 42 to enter the image acquisition unit 40 to acquire the fingerprint image.

[0038] Specifically, depending on the position of each light-emitting unit relative to the image-collecting unit, the direction of the 45-degree light emitted by the light-emitting unit is usually different. For example, Figure 5 In the above, if the light-emitting unit 41d emits light, the light emission angle is 45 degrees towards the finger pointing to the upper right; if the light-emitting unit 41b emits light, the light emission angle is 45 degrees towards the finger pointing to the upper left.

[0039] Furthermore, the control unit is also used to calculate the distance between the center point of the touch area corresponding to the user's body part on the touch screen and each light-emitting unit when a touch signal is received from the user's touch screen, and to determine the light-emitting unit corresponding to the smallest distance value as the target light-emitting unit.

[0040] In practical implementation, in order to reduce light intensity loss and avoid the problem of high energy consumption caused by multiple light-emitting units emitting light at the same time, the principle of proximity can be followed to select a target light-emitting unit from multiple light-emitting units to emit light. For ease of explanation, taking a user's finger touching the display screen as an example, when the control unit receives the touch signal of the finger touching the display screen, it can obtain the center point position of the touch area corresponding to the finger touching the display screen, and then calculate the distance value between the center point and each light-emitting unit. The light-emitting unit corresponding to the smallest distance value is determined as the target light-emitting unit. That is, the light-emitting unit closest to the touch area corresponding to the finger is determined as the target light-emitting unit.

[0041] For example, such as Figure 9 The diagram shows a top view of another under-screen biometric acquisition system. In this view, the finger is closest to the light-emitting unit 41a, therefore, the light-emitting unit 41a is the target light-emitting unit; as shown... Figure 10The diagram shows a top view of another under-screen biometric acquisition system. In this view, the finger is closest to the light-emitting unit 41b, therefore, the light-emitting unit 41b is the target light-emitting unit; Figure 11 The diagram shows a top view of another under-screen biometric acquisition system. In this view, the finger is closest to the light-emitting unit 41c, therefore, the light-emitting unit 41c is the target light-emitting unit; Figure 12 The diagram shows a top view of another under-screen biometric acquisition system. In this diagram, the finger is closest to the light-emitting unit 41d, so the light-emitting unit 41d is the target light-emitting unit.

[0042] Furthermore, the control unit is also used to select one light-emitting unit from at least two light-emitting units as the target light-emitting unit if the minimum distance value corresponds to at least two light-emitting units. For example, such as Figure 4 As shown, if the minimum distance value corresponds to two light-emitting units, namely light-emitting unit 41c and light-emitting unit 41d, then any one of the light-emitting units 41c and light-emitting unit 41d can be selected as the target light-emitting unit. Of course, the target light-emitting unit can also be selected according to certain rules. For example, if the light-emitting unit 41c emitted light last time, then the light-emitting unit 41d can be selected to emit light this time.

[0043] Furthermore, the control unit is also used to calculate the area width of the touch area corresponding to the user's body part on the touch screen, determine the sub-light-emitting unit corresponding to the area width from the target light-emitting unit, and control the sub-light-emitting unit to emit light to the touch position on the screen at a preset light-emitting angle.

[0044] Taking the user's finger touching the display screen as an example, in the specific implementation, considering that the length of the light-emitting unit is usually relatively long and longer than the touch area corresponding to the finger, a portion of the light-emitting units corresponding to the touch area can be selected from the target light-emitting units, i.e. the sub-light-emitting units mentioned above, based on the width of the touch area corresponding to the finger. It is only necessary to control the sub-light-emitting unit to emit light at a preset light-emitting angle, without the entire target light-emitting unit emitting light, thereby further reducing light intensity loss.

[0045] Furthermore, such as Figure 5 As shown, there is an air gap between the image acquisition unit 40 and the display screen 42. In actual implementation, in order to ensure that the light that cannot reach the fingerprint is totally reflected within the screen of the display screen, an appropriate air gap is usually left between the image acquisition unit 40 and the display screen 42. The width of the air gap between the image acquisition unit 40 and the display screen 42 can be calculated according to actual needs.

[0046] Furthermore, each light-emitting unit is attached to the display screen 42. Each light-emitting unit is attached to the image acquisition unit 40. That is, each light-emitting unit can be directly attached to the display screen 42, and each light-emitting unit can be directly attached to the side of the image acquisition unit 40. This direct attachment method can minimize the occupation of hardware space and avoid incomplete biometric image acquisition caused by the lack of reflected light from the user's body parts.

[0047] Furthermore, if the user's body part is their finger, the biometric image of that body part is a fingerprint image. The finger can be any finger of the user, and the corresponding biometric image is the fingerprint image for each finger. This fingerprint image includes fingerprint features analyzed from eight directions: points, intersections, bridges, branches, eyes, short lines, ridge endpoints, and forks.

[0048] This invention provides an under-display biometric data acquisition method, comprising: when a control unit receives a touch signal from a user touching the display screen, determining a target light-emitting unit from a plurality of light-emitting units, and controlling the target light-emitting unit to emit light at a preset light-emitting angle toward the touch position on the display screen; wherein, if there is no biometric feature at the position illuminated by the light, the light is totally reflected within the display screen; if there is a biometric feature at the position illuminated by the light, the light illuminates the user's body part on the touch screen; and an image acquisition unit receives the reflected light from the user's body part to obtain a biometric image of the user's body part.

[0049] The above-mentioned under-display biometric data acquisition method uses edge lighting of the light-emitting unit to achieve fingerprint acquisition, which can improve image quality, reduce screen wear and tear, and reduce image acquisition time.

[0050] The above are merely exemplary embodiments of the present invention and are not intended to limit the scope of protection of the present invention, which is determined by the appended claims. The term "exemplary" as used herein means "serving as an example, embodiment, or illustration." Any embodiment illustrated herein as "exemplary" is not necessarily to be construed as superior to or better than other embodiments.

[0051] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An under-screen biometric data acquisition system, characterized in that, include: The system includes a display screen, a control unit, an image acquisition unit, and multiple light-emitting units surrounding the image acquisition unit; wherein the image acquisition unit and each of the light-emitting units are disposed below the display screen; each of the light-emitting units is communicatively connected to the control unit; and each of the light-emitting units is directly attached to the side of the image acquisition unit. The control unit is used to determine a target light-emitting unit from a plurality of light-emitting units when it receives a touch signal from a user touching the display screen, and control the target light-emitting unit to emit light towards the touch position on the display screen at a preset light emission angle; wherein, if there are no biometric features at the position illuminated by the light, the light is totally reflected within the display screen; if there are biometric features at the position illuminated by the light, the light illuminates the user's body part touching the display screen; The image acquisition unit is used to receive reflected light from the user's body parts and obtain biometric images of the user's body parts. The preset light emission angle is 45 degrees; wherein, depending on the position of each light emission unit relative to the image acquisition unit, the direction of the 45-degree light emitted by each light emission unit is different.

2. The system according to claim 1, characterized in that, The control unit is further configured to, when receiving a touch signal from a user touching the display screen, calculate the distance between the center point of the touch area corresponding to the user's body part touching the display screen and each of the light-emitting units, and determine the light-emitting unit corresponding to the smallest distance value as the target light-emitting unit.

3. The system according to claim 2, characterized in that, The control unit is further configured to select one light-emitting unit from the at least two light-emitting units as the target light-emitting unit if the number of light-emitting units corresponding to the minimum distance value is at least two.

4. The system according to claim 1, characterized in that, The control unit is also used to calculate the area width of the touch area corresponding to the user's body part touching the display screen, determine the sub-light-emitting unit corresponding to the area width from the target light-emitting unit, and control the sub-light-emitting unit to emit light to the touch position on the display screen at a preset light-emitting angle.

5. The system according to claim 1, characterized in that, There is an air gap between the image acquisition unit and the display screen.

6. The system according to claim 1, characterized in that, Each of the light-emitting units is attached to the display screen.

7. The system according to claim 1, characterized in that, If the user's body part is the user's finger, the biometric image of the user's body part is a fingerprint image.

8. A method for collecting biometric features under a screen, characterized in that, The method includes: When the control unit receives a touch signal from a user touching the display screen, it determines a target light-emitting unit from multiple light-emitting units and controls the target light-emitting unit to emit light towards the touch position on the display screen at a preset light emission angle; wherein, if there are no biometric features at the location illuminated by the light, the light is totally reflected within the display screen; if there are biometric features at the location illuminated by the light, the light illuminates the user's body part touching the display screen; The image acquisition unit receives reflected light from the user's body parts to obtain biometric images of the user's body parts; each of the light-emitting units is directly attached to the side of the image acquisition unit; the preset light emission angle is 45 degrees; wherein, depending on the position of each light-emitting unit relative to the image acquisition unit, the direction of the 45-degree light emitted by each light-emitting unit is different.

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