US 12,468,051 B2
Radiation detector, method of driving the radiation detector, and radiation-image pickup system with comparators at different distances from corresponding pixels
Tatsuhito Goden, Tokyo (JP); and Takanori Watanabe, Kanagawa (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Dec. 6, 2023, as Appl. No. 18/530,720.
Claims priority of application No. 2022-200560 (JP), filed on Dec. 15, 2022.
Prior Publication US 2024/0201402 A1, Jun. 20, 2024
Int. Cl. G01T 1/17 (2006.01); G01T 1/20 (2006.01); G21H 1/06 (2006.01)
CPC G01T 1/17 (2013.01) [G01T 1/20185 (2020.05); G21H 1/06 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A radiation detector comprising:
a plurality of pixels disposed in a pixel area and including a first pixel and a second pixel disposed in a same column, the plurality of pixels being disposed in a matrix and each of the plurality of pixels including a conversion portion configured to directly convert radiation to electric charge;
a first comparator connected with the first pixel via a first vertical signal line; and
a second comparator connected with the second pixel via a second vertical signal line,
wherein a first distance from the conversion portion of the first pixel to the first vertical signal line is different from a second distance from the conversion portion of the second pixel to the second vertical signal line,
wherein the first comparator is configured to receive a first reference signal and compare the first reference signal with an output signal sent from the first pixel to the first comparator via the first vertical signal line,
wherein the second comparator is configured to receive a second reference signal and compare the second reference signal with an output signal sent from the second pixel to the second comparator via the second vertical signal line, the second reference signal being different from the first reference signal, and
wherein the radiation detector is configured to output a comparison result from each of the first comparator and the second comparator.