An under-screen biometric identification apparatus, applicable to an electronic device having a display screen , wherein the display screen has a light leakage area and the under-screen biometric identification apparatus is mounted under the light leakage area of the display screen , wherein the display screen comprises a light emitting layer , a third quarter-wave plate and a second linear polarizer , wherein the third quarter-wave plate is disposed above the light emitting layer , the second linear polarizer is disposed above the third quarter-wave plate , the under-screen biometric identification apparatus comprising: an optical function layer , structured to be arranged under the light leakage area of the display screen , the optical function layer comprising a first linear polarizer , a first quarter-wave plate and a second quarter-wave plate , wherein the second quarter-wave plate , the first linear polarizer , and the first quarter-wave plate are arranged in a stack manner, the first linear polarizer is disposed between the second quarter-wave plate and the first quarter-wave plate , the first quarter-wave plate is disposed at a side of the optical function layer adjacent to the optical biometric sensor; an optical biometric sensor comprising an optical sensing array structured to be arranged below the optical function layer , wherein a biometric collection area of the optical biometric sensor is within a display area of the display screen ; wherein the optical sensing array is configured to receive reflected light from a finger above the display screen and transmitted through the second quarter-wave plate , the first linear polarizer and the first quarter-wave plate , and convert the received light into biometric detection signal for biometric identification; wherein the optical biometric sensor is included in an optical identification module configured to perform biometric identification; and the first linear polarizer and the first quarter-wave plate are configured to weaken light reflected from the optical identification module from being transmitted to the display screen . an optical function layer , structured to be arranged under the light leakage area of the display screen , the optical function layer comprising a first linear polarizer , a first quarter-wave plate and a second quarter-wave plate , wherein the second quarter-wave plate , the first linear polarizer , and the first quarter-wave plate are arranged in a stack manner, the first linear polarizer is disposed between the second quarter-wave plate and the first quarter-wave plate , the first quarter-wave plate is disposed at a side of the optical function layer adjacent to the optical biometric sensor; an optical biometric sensor comprising an optical sensing array structured to be arranged below the optical function layer , wherein a biometric collection area of the optical biometric sensor is within a display area of the display screen ; wherein the optical sensing array is configured to receive reflected light from a finger above the display screen and transmitted through the second quarter-wave plate , the first linear polarizer and the first quarter-wave plate , and convert the received light into biometric detection signal for biometric identification; wherein the optical biometric sensor is included in an optical identification module configured to perform biometric identification; and the first linear polarizer and the first quarter-wave plate are configured to weaken light reflected from the optical identification module from being transmitted to the display screen . <EOS>