Device with OLED matrix of active pixels with cathode voltage regulation, and corresponding method

A device, comprising:

• a matrix of active pixels, each active pixel comprising:
• a control circuit coupled to an anode side terminal;
• and
• an OLED diode having an anode coupled to the control circuit and a cathode coupled to a cathode supply line;
• at least one dummy pixel comprising:
• a dummy control circuit;
• and
• a dummy OLED diode having an anode coupled to the dummy control circuit and a cathode coupled to the cathode supply line;
• wherein the dummy OLED diode has substantially similar operating characteristics as the OLED diode, and the dummy control circuit has substantially similar operating characteristics as the control circuit;
• a current source;
• a switch having a first terminal coupled to the current source and a second terminal coupled to the anode side terminal;
• wherein the dummy control circuit is coupled between the second terminal of the switch and the anode of the dummy OLED diode;
• and
• regulation circuitry coupled between the anode side terminal and the cathode supply line.