US 11,706,540 B2
Event-driven image sensor and method of reading the same
Josep Segura Puchades, Grenoble (FR)
Assigned to Commissariat à l'Energie Atomique et aux Energies Alternatives, Paris (FR)
Filed by Commissariat à l'Energie Atomique et aux Energies Alternatives, Paris (FR)
Filed on Apr. 7, 2021, as Appl. No. 17/301,563.
Claims priority of application No. 2004206 (FR), filed on Apr. 28, 2020.
Prior Publication US 2021/0337150 A1, Oct. 28, 2021
Int. Cl. H04N 25/75 (2023.01); H04N 25/76 (2023.01)
CPC H04N 25/75 (2023.01) [H04N 25/76 (2023.01)] 13 Claims
OG exemplary drawing
 
1. An event-driven sensor comprising:
a pixel array;
a column readout circuit coupled to column output lines of the pixel array, the column readout circuit comprising, for each of the column output lines, a column register cell coupled to the column output line, the column register cells being coupled in series with each other to propagate a first token, wherein each column register cell is configured to activate a column event output signal when it receives the first token while an event is indicated on the column output line; and
a row readout circuit coupled to row output lines of the pixel array, the row readout circuit comprising, for each of a plurality of sub-groups of the row output lines, a row register cell coupled to a plurality of the row output lines via a logic gate configured to combine row event signals on the plurality of the row output lines to generate a combined row event signal, the row register cells being coupled in series with each other to propagate a second token, wherein each row register cell is configured to activate a row event output signal when it receives the second token while an event is indicated by the combined row event signal of the sub-group.