System for acquiring digital fingerprints equipped with an improved device for addressing lines

A fingerprint acquisition system, comprising a touch surface configured so as to provide location information (InfoLoc) for at least one contact point (PCO) of a finger having a fingerprint in contact with the touch surface, the system comprising:

• a TFT panel, arranged underneath the touch surface, comprising a detection array comprising M rows at least some of which comprise detection cells (P(i,j)) for detecting an image representative of the fingerprint, a row-addressing system being integrated into the array, and configured so as to activate, row after row, the detection cells (P(i,j)) of a corresponding row in a scanning direction of the rows,
• a calculation device (CALC), configured so as to receive the location information (InfoLoc) and so as to command the addressing system to address the array starting from an address range (ZA) grouping together a subset of rows from among the M rows of the array, and determined on the basis of the location information (InfoLoc),
• wherein the addressing system comprises a shift register (SR) comprising M stages (ET), each of the M stages (ET) having an output connected to a corresponding row input, and an additional shift register (SSR), comprising N stages, called additional stages (ETA), where N<M, the additional shift register (SSR) being connected to the row inputs by way of the shift register (SR), each additional stage (ETA) being connected to the first stage (ET) of a group of stages (ET) of the shift register (SR).