US 11,887,402 B2
Fingerprint sensor and display device including the same
Young Ok Park, Seoul (KR); Jun Woo You, Seongnam-si (KR); Byung Hoon Kim, Hwaseong-si (KR); and June Hyoung Park, Seoul (KR)
Assigned to SAMSUNG DISPLAY CO., LTD., Yongin-si (KR)
Filed by SAMSUNG DISPLAY CO., LTD., Yongin-si (KR)
Filed on Jan. 20, 2021, as Appl. No. 17/152,979.
Claims priority of application No. 10-2020-0055686 (KR), filed on May 11, 2020.
Prior Publication US 2021/0350100 A1, Nov. 11, 2021
Int. Cl. G06V 40/13 (2022.01); H10K 59/40 (2023.01)
CPC G06V 40/1318 (2022.01) [H10K 59/40 (2023.02)] 18 Claims
OG exemplary drawing
 
1. A fingerprint sensor comprising:
a light sensing layer comprising a light sensing element, wherein a sensing current flows in the light sensing element according to incident light; and
a collimator layer disposed on the light sensing layer and comprising a light guide unit guiding light to the light sensing element,
wherein the light guide unit comprises:
a light-transmitting unit configured to provide light to the light sensing element; and
a first light-blocking unit disposed on an inner surface of the light-transmitting unit, wherein a height of the first light-blocking unit is different from a height of the light-transmitting unit,
wherein a distance between a first outer surface of the light-transmitting unit and the inner surface of the light transmitting unit decreases as the light sensing layer is approached,
wherein a lowermost portion of the first light-blocking unit overlaps a lowermost portion of the light-transmitting unit in a thickness direction of the first light-blocking unit, wherein the lowermost portion of the first light-blocking unit is spaced apart from the lowermost portion of the light-transmitting unit in the thickness direction,
wherein the lowermost portion of the first light-blocking unit is a first vertex formed by a first side surface of the first light-blocking unit and a second side surface of the first-light blocking unit, and the lowermost portion of the light-transmitting unit is a second vertex formed by the first outer surface and a second outer surface of the light-transmitting unit.