US 12,136,290 B2
Device for recognizing fingerprints and method of operating the same
Seung-Woo Lee, Seoul (KR)
Assigned to UNIVERSITY-INDUSTRY COOPERATION GROUP OF KYUNG HEE UNIVERSITY, Yongin-si (KR)
Filed by UNIVERSITY-INDUSTRY COOPERATION GROUP OF KYUNG HEE UNIVERSITY, Yongin-si (KR)
Filed on Sep. 18, 2023, as Appl. No. 18/469,135.
Claims priority of application No. 10-2022-0117579 (KR), filed on Sep. 19, 2022.
Prior Publication US 2024/0096128 A1, Mar. 21, 2024
Int. Cl. G06V 40/13 (2022.01); G06F 3/041 (2006.01)
CPC G06V 40/1318 (2022.01) [G06F 3/0412 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A device for recognizing fingerprints, the device comprising:
a touch sensor for detecting a contact area on a display where a user's finger touches for fingerprint recognition;
a pixel circuit that comprises a plurality of light-emitting diodes (LEDs) and selectively drives the plurality of LEDs as at least one emission LED and at least one detection LED according to the detected contact area, wherein the at least one emission LED emits light to the detected contact area, the at least one detection LED detects reflected light of the emitted light, and photocurrent according to the detected reflected light is accumulated in a capacitor of the at least one detection LED; and
a processor configured to control operations of the touch sensor and the pixel circuit and to recognize the user's fingerprint by distinguishing ridges and valleys in the contact area based on the accumulated photocurrent,
wherein the plurality of LEDs are independently arranged at equal intervals and a critical angle is determined with respect to the intervals, and
wherein the processor is configured to control the pixel circuit to selectively drive the at least one emission LED and the at least one detection LED among the plurality of LEDs within an interval in which an incident angle at which the emitted light is detected by the at least one detection LED is equal to the determined critical angle.