Method for determining a refresh frequency for a matrix of oled active pixels and corresponding device

A device, comprising:

• a matrix of active OLED pixels having a control circuit configured to be controlled at a refresh frequency;
• first and second dummy control circuits analogous to the control circuit;
• a controller configured to control the first and second dummy control circuits at a first time, wherein the controller controls the first dummy control circuit by applying a first voltage to an input of the first dummy control circuit so as to obtain a first output voltage, and controls the second dummy control circuit by applying the first output voltage to an input of the second dummy control circuit and operating the second dummy control circuit such that a leakage current flows therethrough, so as to obtain a second output voltage,
• determining circuitry configured to determine an elapsed time separating the first time from a second time at which a difference between the first and second output voltages reaches a threshold, and determine the refresh frequency of the matrix of OLED pixels based upon the elapsed time.

A device, comprising:

• at least one OLED pixel;
• a control circuit for controlling a refresh rate of the at least one OLED pixel;
• first and second dummy control circuits, each having substantially similar operating characteristics to the control circuit;
• a controller and a logic circuit cooperating therewith, the controller and logic circuit configured to:
• switch on the first and second dummy control circuits and apply an input voltage thereto such that the first and second dummy control circuits output first and second output voltages respectively, and
• at a first time, switch off the second dummy control circuit such that a leakage current flows through the second dummy control circuit to ground, causing the second output voltage to change,
• comparison circuitry configured to determine a second time at which, due to the change in the second output voltage, a difference between the first output voltage and the second output voltage is greater than a threshold;
• and
• determination circuitry configured to determine the refresh frequency based upon an elapsed time between the first time and the second time.

A device, comprising:

• at least one OLED pixel;
• a control circuit for controlling the at least one OLED pixel;
• first and second dummy control circuits, each having substantially similar operating characteristics to the control circuit;
• a controller and a logic circuit cooperating therewith, the controller and logic circuit configured to switch on the first and second dummy control circuits and apply an input voltage thereto, and at a first time, switch off the second dummy control circuit;
• comparison circuitry coupled to outputs of the first and second dummy control circuits;
• and
• refresh frequency determination circuitry coupled to the comparison circuitry.