System for making a thermo-active device temperature dependent

Claim 1

A temperature-dependent addressing system comprising: a temperature-dependent device whose operation depends on the local heating applied to a layer of thermo-active material; means for producing said local heating, including an assembly of electrodes and a means for passing a transitory electric current through one of said electrodes wherein said assembly of electrodes are situated in the immediate vicinity of said layer; a memory means containing data pertaining to the thermal control of said electrodes; a means for thermally addressing said one electrode as a function of said data wherein each one of said assembly of electrodes comprises a conducting material having a temperature coefficient; a resistance r connected to the output of said electrode wherein at least a portion of said heating current passes through said resistance r, and whereby the potential difference v appearing at the terminals of said resistance r is proportional to the heating of said one electrode; an analogue-digital converter which transmits for each of said heating electrodes, said potential difference v to one of the inputs of a comparator wherein the second input of said comparator receives said data relative to the thermal control of said electrode; circuit means for adjusting the heating time of said electrode wherein said circuit means is connected to the output of said comparator.