US 11,657,643 B1
Fingerprint sensing device
Shu-Fang Wang, Hsinchu (TW); and Dong-Hai Huang, Hsinchu (TW)
Assigned to Novatek Microelectronics Corp., Hsinchu (TW)
Filed by Novatek Microelectronics Corp., Hsinchu (TW)
Filed on Mar. 23, 2022, as Appl. No. 17/701,690.
Claims priority of provisional application 63/300,054, filed on Jan. 17, 2022.
Int. Cl. G06V 40/13 (2022.01); G06F 3/041 (2006.01); G06F 3/042 (2006.01); G06F 21/32 (2013.01)
CPC G06V 40/1318 (2022.01) [G06F 3/042 (2013.01); G06F 3/0412 (2013.01); G06F 21/32 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A fingerprint sensing device, comprising:
a plurality of pixel blocks, arranged in an array, and each of the pixel blocks comprising a conversion gain, wherein at least two of the conversion gains are different, and the pixel block located in a central location of the array has a minimum conversion gain,
wherein each of the pixel blocks comprises a plurality of pixel circuits, and each of the pixel circuits comprises the same conversion gain,
each of the pixel circuits comprises a floating node, and the same conversion gain of each of the pixel circuits is determined according to a capacitance value at the floating node.