Image sensor

An image pick-up is described which comprises a number of active sensor elements (11; 12; 13; 14) arranged in an array as well as a number of conductive lines extending over the surface of the array for the transfer of supply and signals. Each sensor element comprises a light sensor (20) and an amplifier. According to the invention, a reduction in the number of lines can be achieved while functionality is maintained. In a first and a second embodiment (11; 12), a sensor element comprises a first switch (S1) associated with the sensor and a second switch (S2; S3) associated with the amplifier, the switches being controlled by a common control signal. In a third embodiment (13), a sensor element comprises a series arrangement of a first switch (S1) and a second switch (S2) included between the sensor and a supply line. In a fourth embodiment (14), a select signal is also used as a supply for the amplifier.