CN-115294613-B - Under-screen biological feature acquisition system and method

CN115294613BCN 115294613 BCN115294613 BCN 115294613BCN-115294613-B

Abstract

The invention provides an under-screen biological feature acquisition system and method, wherein a control unit is used for determining a target light-emitting unit from a plurality of light-emitting units and controlling the target light-emitting unit to emit light according to a preset light-emitting angle when a touch signal of a user touching a display screen is received, the light is totally reflected in the display screen if no biological feature exists at the light-irradiated position, the light illuminates the user body part of the user touching the display screen if the biological feature exists at the light-irradiated position, and a graph acquisition unit is used for receiving the reflected light of the user body part to obtain a corresponding biological feature image. The system can collect the biological characteristic image through the independent control unit, the image collecting unit and the light emitting unit, and a light emitting device is not required to be arranged in the display screen, so that the collection time can be reduced, the screen loss of the display screen is reduced, and the effect of the collected biological characteristic image can be improved in a mode of totally reflecting light in the display screen when the biological characteristic does not exist at the position irradiated by the light.

Inventors

FENG JIXIONG
WANG CHANGHAI
TIAN ZHIMIN
LI BAOLIANG
LIU QI
ZHENG FENGDE

Assignees

北京集创北方科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20220816

Claims (8)

1. The under-screen biological characteristic acquisition system is characterized by comprising a display screen, a control unit, a graph acquisition unit and a plurality of light-emitting units surrounding the graph acquisition unit, wherein the graph acquisition unit and each light-emitting unit are arranged below the display screen, each light-emitting unit is respectively in communication connection with the control unit, and each light-emitting unit is directly attached to the side face of the graph acquisition unit; The 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 the display screen is received, and controlling the target light-emitting unit to emit light to a touch position on the display screen according to a preset light-emitting angle, wherein if no biological feature exists at the position irradiated by the light, the light is totally reflected in the display screen; the image acquisition unit is used for receiving the reflected light of the user body part and obtaining a biological characteristic image of the user body part; The preset light-emitting angle is 45 degrees, wherein the orientation of 45-degree light rays emitted by each light-emitting unit is different according to the different positions of each light-emitting unit relative to the image acquisition unit.
2. The system according to claim 1, wherein the control unit is further configured to, when receiving a touch signal from a user touching the display screen, calculate a distance value between a center point of a touch area corresponding to a user body part touching the display screen and each of the light emitting units, and determine a light emitting unit corresponding to a minimum distance value as the target light emitting unit.
3. The system of claim 2, wherein the control unit is further configured 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.
4. The system according to claim 1, wherein the control unit is further configured to calculate a region width of a touch region corresponding to a body part of a user touching the display screen, determine a sub-light emitting unit corresponding to the region width from the target light emitting units, and control the sub-light emitting unit to emit light to a touch position on the display screen at a preset light emitting angle.
5. The system of claim 1, wherein an air gap exists between the graphics unit and the display screen.
6. The system of claim 1, wherein each of the light emitting units is attached to the display screen.
7. The system of claim 1, wherein if the user body part is a finger of the user, the biometric image of the user body part is a fingerprint image.
8. An under-screen biometric acquisition method, the method comprising: When a touch signal of a user touching a display screen is received, a control unit determines a target light-emitting unit from a plurality of light-emitting units, and controls the target light-emitting unit to emit light to a touch position on the display screen according to a preset light-emitting angle, wherein if no biological feature exists at the position irradiated by the light, the light is totally reflected in the display screen; The image acquisition unit receives reflected light rays of the user body part to obtain a biological characteristic image of the user body part, each light-emitting unit is directly attached to the side face of the image acquisition unit, the preset light-emitting angle is 45 degrees, and the directions of the 45-degree light rays emitted by each light-emitting unit are different according to different positions of each light-emitting unit relative to the image acquisition unit.

Description

Under-screen biological feature acquisition system and method Technical Field The invention relates to the technical field of biological feature collection, in particular to an under-screen biological feature collection system and method. Background In the related art, when the large-area display screen is used for collecting fingerprints, a light emitting device array is generally arranged in the large-area display screen, when the finger touches the display screen, a control unit of the mobile phone is required to scan all the light emitting devices arranged in the display screen, confirm the light emitting devices needing to emit light, then send a light emitting instruction to the light emitting devices needing to emit light, and send a light emitting prohibiting instruction to the light emitting devices needing not to emit light. Disclosure of Invention The invention aims to provide an under-screen biological characteristic acquisition system and method, which are used for reducing acquisition time, reducing screen loss of a display screen and improving the effect of acquired biological characteristic images. The under-screen biological feature collection system comprises a display screen, a control unit, a graph acquisition unit and a plurality of light-emitting units surrounding the graph acquisition unit, wherein the graph acquisition unit and each light-emitting unit are arranged below the display screen, each light-emitting unit is respectively in communication connection with the control unit, the control unit is used for determining a target light-emitting unit from the plurality of light-emitting units when receiving a touch signal of a user touching the display screen, controlling the target light-emitting unit to emit light to a touch position on the display screen according to a preset light-emitting angle, if no biological feature exists at the position irradiated by the light, the light totally reflects in the display screen, if the biological feature exists at the position irradiated by the light, the light irradiates the user body part of the user touching the display screen, and the graph acquisition unit is used for receiving the reflected light of the user body part to obtain a biological feature image of the user body part. Further, the preset light emitting angle is 45 degrees. Further, the control unit is further configured to, when receiving a touch signal that the user touches the display screen, calculate a distance value between a center point of a touch area corresponding to a body part of the user touching the display screen and each light emitting unit, and determine a light emitting unit corresponding to the smallest distance value as the target light emitting unit. Further, 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. Further, the control unit is further configured to calculate an area width of a touch area corresponding to a body part of a user touching the display screen, determine a sub-light emitting unit corresponding to the area width from the target light emitting units, and control the sub-light emitting unit to emit light to a touch position on the display screen according to a preset light emitting angle. Further, an air gap exists between the image acquisition unit and the display screen. Further, each light emitting unit is attached to the display screen. Further, each light-emitting unit is attached to the image capturing unit. Further, if the user's body part is a user's finger, the biometric image of the user's body part is a fingerprint image. The method for collecting the under-screen biological characteristics comprises the steps that when a control unit receives a touch signal of a user touching a display screen, a target light-emitting unit is determined from a plurality of light-emitting units, the target light-emitting unit is controlled to emit light to a touch position on the display screen according to a preset light-emitting angle, if no biological characteristics exist at the light-irradiated position, the light is totally reflected in the display screen, if biological characteristics exist at the light-irradiated position, the light illuminates a user body part of the user touching the display screen, and a graph collecting unit receives reflected light of the user body part to obtain a biological characteristic image of the user body part. The system comprises a display screen, a control unit, a picture taking unit and a plurality of light emitting units surrounding the picture taking unit, wherein the picture taking unit and each light emitting unit are arranged below the display screen, each light emitting unit is respectively in communication connection with the control unit, the control unit is used for determining a target light emitting u