US 12,262,135 B2
Pixel reading device and pixel reading method
Min Huang, Taoyuan (TW); and Chi-Ting Chen, Hsinchu (TW)
Assigned to Novatek Microelectronics Corp., Hsinchu (TW)
Filed by Novatek Microelectronics Corp., Hsinchu (TW)
Filed on May 22, 2023, as Appl. No. 18/320,998.
Prior Publication US 2024/0397231 A1, Nov. 28, 2024
Int. Cl. H04N 25/772 (2023.01); G06V 40/13 (2022.01); H04N 21/44 (2011.01)
CPC H04N 25/772 (2023.01) [G06V 40/1318 (2022.01)] 10 Claims
OG exemplary drawing
 
1. A pixel reading device, comprising:
a first capacitor, having a first terminal coupled to a fingerprint sensing pixel to receive a sensing voltage;
a second capacitor, having a first terminal coupled to a second terminal of the first capacitor;
a voltage generating circuit, coupled to a second terminal of the second capacitor to provide a compensation voltage, wherein the compensation voltage is at an initial level during a sensing period of the fingerprint sensing pixel, and the compensation voltage is pulled up from the initial level to a compensation level during a level reading period of the fingerprint sensing pixel to compensate a common mode component of the sensing voltage; and
an analog front-end circuit, having an input terminal coupled to the second terminal of the first capacitor.